Cheapest priced copy (Commander 2018): $0.49 at Card Kingdom, near mint, their price list as of .
Jeskai Infiltrator 
Creature — Human Monk · 2/3 · Rare · Fate Reforged · #36
This creature can't be blocked as long as you control no other creatures.
When this creature deals combat damage to a player, exile it and the top card of your library in a face-down pile, shuffle that pile, then manifest those cards. (To manifest a card, put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $0.49 to $1.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2018 | 93 | Rare | $0.49 | — |
| Fate Reforged | 36 | Rare | $0.49 | $0.49 |
| Fate Reforged Promos | 36s | Rare | — | $0.59 |
| The List | FRF-36 | Rare | — | — |
| Ugin's Fate | 36 | Rare | $1.99 | — |
30 rulings from Wizards of the Coast
- 24 November 2014If a double-faced card is manifested, it will be put onto the battlefield face down. While face down, it can't transform. If the front face of the card is a creature card, you can turn it face up by paying its mana cost. If you do, its front face will be up.
- 24 November 2014The pile is shuffled to disguise from your opponents which manifested creature is which. After you manifest the cards, you can look at them.
- 24 November 2014Any time you have priority, you may turn a manifested creature face up by revealing that it's a creature card (ignoring any copy effects or type-changing effects that might be applying to it) and paying its mana cost. This is a special action. It doesn't use the stack and can't be responded to.
- 24 November 2014Unlike a face-down creature that was cast using the morph ability, a manifested creature may still be turned face up after it loses its abilities if it's a creature card.
- 24 November 2014If Jeskai Infiltrator isn't on the battlefield as its triggered ability resolves, you'll manifest just the top card of your library.
- 24 November 2014A card's owner is public information at all times. If the two cards you exile are owned by different players (perhaps because you gained control of a Jeskai Infiltrator owned by your opponent), which card is which is no longer hidden from your opponent. That player will know which face-down creature they own.
- 24 November 2014Because face-down creatures don't have names, they can't have the same name as any other creature, even another face-down creature.
- 24 November 2014At any time, you can look at a face-down permanent you control. You can't look at face-down permanents you don't control unless an effect allows you to or instructs you to.
- 24 November 2014You must ensure that your face-down spells and permanents can easily be differentiated from each other. You're not allowed to mix up the cards that represent them on the battlefield in order to confuse other players. The order they entered the battlefield should remain clear. Common methods for indicating this include using markers or dice, or simply placing them in order on the battlefield. You must also track how each became face down (manifested, cast face down using the morph ability, and so on).
- 24 November 2014Because the permanent is on the battlefield both before and after it's turned face up, turning a permanent face up doesn't cause any enters-the-battlefield abilities to trigger.
- 24 November 2014Turning a permanent face up or face down doesn't change whether that permanent is tapped or untapped.
- 24 November 2014There are no cards in the Fate Reforged set that would turn a face-down instant or sorcery card on the battlefield face up, but some older cards can try to do this. If something tries to turn a face-down instant or sorcery card on the battlefield face up, reveal that card to show all players it's an instant or sorcery card. The permanent remains on the battlefield face down. Abilities that trigger when a permanent turns face up won't trigger, because even though you revealed the card, it never turned face up.
- 24 November 2014If a face-down permanent you control leaves the battlefield, you must reveal it. You must also reveal all face-down spells and permanents you control if you leave the game or if the game ends.
- 24 November 2014The face-down permanent is a 2/2 creature with no name, mana cost, creature types, or abilities. It's colorless and has a mana value of 0. Other effects that apply to the permanent can still grant or change any of these characteristics.
- 24 November 2014If a manifested creature would have morph if it were face up, you may also turn it face up by paying its morph cost.
- 24 November 2014A permanent that turns face up or face down changes characteristics but is otherwise the same permanent. Spells and abilities that were targeting that permanent, as well as Auras and Equipment that were attached to the permanent, aren't affected.
- 24 November 2014If you manifest a card owned by an opponent and you leave the game, that card is exiled.
- 13 July 2018You must ensure that your face-down spells and permanents can easily be differentiated from each other. You're not allowed to mix up the cards that represent them on the battlefield to confuse other players. The order they entered the battlefield should remain clear. Common methods for indicating this include using markers or dice, or simply placing them in order on the battlefield. You must also track how each became face down (manifested, cast face down using a morph ability, and so on).
- 13 July 2018At any time, you can look at a face-down permanent you control. You can't look at face-down permanents you don't control unless an effect instructs you to do so.
- 13 July 2018There are no cards in this set that would turn a face-down instant or sorcery card on the battlefield face up, but some older cards can try to do this. If something tries to turn a face-down instant or sorcery card on the battlefield face up, reveal that card to show all players it's an instant or sorcery card. The permanent remains on the battlefield face down. Abilities that trigger when a permanent turns face up won't trigger, because even though you revealed the card, it never turned face up.
- 13 July 2018The face-down permanent is a 2/2 creature with no name, mana cost, creature types, or abilities. It's colorless and has a mana value of 0. Other effects that apply to the permanent can still grant or change any of these characteristics.
- 13 July 2018If a face-down permanent you control leaves the battlefield, you must reveal it. You must also reveal all face-down spells and permanents you control if you leave the game or if the game ends.
- 13 July 2018Some previous Magic sets feature double-faced cards, which have a Magic card face on each side rather than a Magic card face on one side and a Magic card back on the other. If a double-faced card is manifested, it will be put onto the battlefield face down. While face down, it can't transform. If the front face of the card is a creature card, you can turn it face up by paying its mana cost. If you do, its front face will be up. Although a double-faced card can enter the battlefield face down, one already on the battlefield can't be turned face down.
- 13 July 2018Turning a permanent face up or face down doesn't change whether that permanent is tapped or untapped.
- 13 July 2018A permanent that turns face up or face down changes characteristics but is otherwise the same permanent. Spells and abilities that were targeting that permanent, as well as Auras and Equipment that were attached to the permanent, aren't affected.
- 13 July 2018Because face-down creatures don't have a name, they can't have the same name as any other creature or share any creature types with any other creature, even another face-down creature.
- 13 July 2018Any time you have priority, you may turn a manifested creature face up by revealing that it's a creature card (ignoring any type-changing effects that might be applying to it) and paying its mana cost. This is a special action. It doesn't use the stack and can't be responded to.
- 13 July 2018Because the permanent is on the battlefield both before and after it's turned face up, turning a permanent face up doesn't cause any enters-the-battlefield abilities to trigger.
- 13 July 2018If an effect tries to return a face-down creature to the battlefield after it leaves (such as Aminatou's second ability or Adarkar Valkyrie's delayed triggered ability), that effect returns the card face up. If it tries to put an instant or sorcery card onto the battlefield this way, that card remains in its current zone instead.
- 13 July 2018The face-down characteristics of a permanent are copiable values. If another object becomes a copy of a face-down creature or if a token is created that's a copy of a face-down creature, that new object is a 2/2 colorless face-up creature with no abilities.