Ancestral Statue + Kozilek's Unsealing + Mondrak, Glory Dominus

Ancestral Statue

Kozilek's Unsealing

Mondrak, Glory Dominus

How it works

1. Cast Ancestral Statue by paying 4.
2. Kozilek's Unsealing's first ability triggers, creating four 0/1 Eldrazi Spawn creature tokens.
3. When Ancestral Statue enters the battlefield, it triggers, returning itself from the battlefield to your hand.
4. Activate the Eldrazi Spawns by sacrificing them, adding CCCC.
5. Repeat.

This clever loop relies on the constant recasting of Ancestral Statue, whose mana value of 4 directly trips Kozilek's Unsealing's first trigger condition to generate a flood of Eldrazi Spawn tokens. Normally, casting the Statue repeatedly would drain your resources, but sacrificing the resulting Eldrazi Spawns for their mana completely funds the Statue's next casting while feeding your sacrifice and enter-the-battlefield counts. Meanwhile, Mondrak, Glory Dominus quietly doubles the yield of every token creation trigger, turning the output of Kozilek's Unsealing from two tokens into an exponential surplus.