Legendary Creature — Human Wizard
Whenever you cast a creature spell, create X 1/1 black Thrull creature tokens, where X is that spell's mana value.
When you control seven or more Thrulls, sacrifice Endrek Sahr.
2/2
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→ Infinite colored mana, Infinite colorless mana, Infinite death triggers
→ Infinite colored mana, Infinite death triggers, Infinite ETB
→ Infinite colored mana, Infinite death triggers, Infinite ETB
→ Infinite card draw, Infinite draw triggers, Near-infinite +1/+1 counters
→ Draw the game
→ Infinite death triggers, Infinite ETB, Infinite LTB
The second ability is a state trigger. Once it triggers, it won't trigger again as long as the ability is on the stack. If the ability is countered and the trigger condition is still true, it will immediately trigger again.
When the second ability resolves, Endrek Sahr will be sacrificed regardless of how many Thrulls you control at that time, even if it's less than seven.
Face-down spells are creature spells, but they have mana value 0.