Cheapest priced copy (Duel Decks: Sorin vs. Tibalt): $0.35 at Card Kingdom, near mint, their price list as of .
Gatekeeper of Malakir 
Creature — Vampire Warrior · 2/2 · Uncommon · Foundations · #752
Kicker {B} (You may pay an additional {B} as you cast this spell.)
When this creature enters, if it was kicked, target player sacrifices a creature of their choice.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
6 printings · $0.35 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Sorin vs. Tibalt | 8 | Uncommon | $0.35 | — |
| Friday Night Magic 2010 | 11 | Rare | — | $1.49 |
| Foundations | 713 | Uncommon | — | $0.49 |
| Foundations | 752 | Uncommon | — | — |
| The List | ZEN-89 | Uncommon | $0.35 | — |
| Zendikar | 89 | Uncommon | $0.35 | $0.49 |
6 rulings from Wizards of the Coast
- 8 November 2024If you copy a kicked spell on the stack, the copy is also kicked. If the copied spell is a permanent spell, the token the copy of that spell becomes when it enters is also kicked.
- 8 November 2024The kicker ability doesn't let you pay a kicker cost more than once.
- 8 November 2024If a card or token enters as a copy of a permanent, the new permanent isn't kicked, even if the original was.
- 8 November 2024If you put a permanent with a kicker ability onto the battlefield without casting it, you can't kick it.
- 8 November 2024To determine a spell's total cost, start with the mana cost (or an alternative cost if another card's effect allows you to pay one instead), add any cost increases (such as kicker), then apply any cost reductions. The spell's mana value remains unchanged, no matter what the total cost to cast it was.
- 8 November 2024If a spell's kicker cost was paid, the spell is "kicked."