Cheapest priced copy (Modern Horizons 3): $29.99 at Card Kingdom, near mint, their price list as of .
Ulamog, the Defiler 
Legendary Creature — Eldrazi · 7/7 · Mythic · Modern Horizons 3 · #383
When you cast this spell, target opponent exiles the top half of their library, rounded up.
Ward—Sacrifice two permanents.
Ulamog enters with a number of +1/+1 counters on it equal to the greatest mana value among cards in exile.
Ulamog has annihilator X, where X is the number of +1/+1 counters on it.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
6 printings · $29.99 to $139.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Horizons 3 | 15 | Mythic | $29.99 | $29.99 |
| Modern Horizons 3 | 383 | Mythic | $69.99 | $139.99 |
| Modern Horizons 3 | 383z | Mythic | — | — |
| Modern Horizons 3 | 389 | Mythic | $32.99Out of stock | $37.99 |
| Modern Horizons 3 | 476 | Mythic | — | — |
| Modern Horizons 3 Promos | 15s | Mythic | — | $42.99 |
6 rulings from Wizards of the Coast
- 7 June 2024If Ulamog is entering the battlefield directly from exile, it will see itself when determining which card has the greatest mana value among cards in exile. If that's Ulamog, which seems likely, it will enter with ten +1/+1 counters on it.
- 7 June 2024Ulamog, the Defiler's first ability will resolve before Ulamog does. If Ulamog is countered or otherwise leaves the stack in response to its triggered ability, the triggered ability will still resolve as normal.
- 7 June 2024Use the number of +1/+1 counters on Ulamog at the time its annihilator ability resolves to determine how many permanents defending player should sacrifice.
- 7 June 2024Annihilator abilities trigger and resolve during the declare attackers step. The defending player sacrifices the required number of permanents of their choice before they declare blockers. Any creatures sacrificed this way won't be able to block.
- 7 June 2024If a creature with annihilator is attacking a planeswalker, and the defending player chooses to sacrifice that planeswalker, the attacking creature continues to attack. It may be blocked. If it isn't blocked, it simply won't deal combat damage to anything.
- 7 June 2024Ulamog, the Defiler has received a minor update to clarify that the target of the first ability exiles the top half of their library. Its updated Oracle text appears above.