Cheapest priced copy (March of the Machine: The Aftermath): $15.99 at Card Kingdom, near mint, their price list as of .
Ob Nixilis, Captive Kingpin 
Legendary Creature — Demon · 4/3 · Mythic · March of the Machine: The Aftermath · #176
Flying, trample
Whenever one or more opponents each lose exactly 1 life, put a +1/+1 counter on Ob Nixilis. Exile the top card of your library. Until your next end step, you may play that card.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $15.99 to $159.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| March of the Machine: The Aftermath | 41 | Mythic | $15.99 | $17.99 |
| March of the Machine: The Aftermath | 91 | Mythic | $24.99 | $37.99 |
| March of the Machine: The Aftermath | 141 | Mythic | — | — |
| March of the Machine: The Aftermath | 176 | Mythic | $22.99 | $37.99 |
| March of the Machine: The Aftermath | 220 | Mythic | — | $159.99Out of stock |
6 rulings from Wizards of the Coast
- 12 May 2023Ob Nixilis's last ability looks at all combat damage dealt to an opponent in total to determine whether it triggers. For example, if three 1/1 creatures deal combat damage to an opponent, that player loses 3 life. Ob Nixilis's ability won't trigger.
- 12 May 2023Playing the card exiled with Ob Nixilis follows the normal rules for playing that card. You must pay its costs, and you must follow all applicable timing rules. For example, if the card is a creature card, you can cast that card by paying its mana cost only during your main phase while the stack is empty.
- 12 May 2023If you don't play the card, it will remain exiled.
- 12 May 2023Unless an effect allows you to play additional lands that turn, you can play a land card exiled with Ob Nixilis only if you haven't played a land yet that turn.
- 12 May 2023You may play the card exiled with Ob Nixilis even if Ob Nixilis leaves the battlefield or you lose control of it.
- 12 May 2023Ob Nixilis's last ability will trigger if an opponent is dealt exactly 1 damage, pays exactly 1 life, or loses exactly 1 life some other way.