Cheapest priced copy (Ravnica Remastered): $0.59 at Card Kingdom, near mint, their price list as of .
Kaya, Orzhov Usurper 
Legendary Planeswalker — Kaya · Mythic · Ravnica Allegiance · #186
+1: Exile up to two target cards from a single graveyard. You gain 2 life if at least one creature card was exiled this way.
−1: Exile target nonland permanent with mana value 1 or less.
−5: Kaya deals damage to target player equal to the number of cards that player owns in exile and you gain that much life.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $0.59 to $10.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mythic Edition | RA8 | Mythic | — | $10.99 |
| The List | RNA-186 | Mythic | $0.99 | — |
| Ravnica Allegiance Promos | 186p | Mythic | $0.99 | $0.99 |
| Ravnica Allegiance | 186 | Mythic | $0.99 | $2.49 |
| Ravnica Remastered | 194 | Rare | $0.59 | $0.79 |
3 rulings from Wizards of the Coast
- 25 January 2019If a permanent has {X} in its mana cost, X is considered to be 0.
- 25 January 2019Kaya's last ability causes you to gain life equal to the number of cards the target player owns in exile, even if an effect causes her to deal more or less than that amount of damage to that player.
- 25 January 2019Tokens that aren't a copy of something else don't have a mana cost. Anything without a mana cost normally has a mana value of 0.