Spawnsire of Ulamog + Earthcraft

Spawnsire of Ulamog

Earthcraft

How it works

1. Pay 4 to activate Spawnsire of Ulamog's first activated ability, creating two 0/1 colorless Eldrazi Spawn creature tokens.
2. Use Earthcraft's activated ability on an Eldrazi spawn token, tapping it and untapping a basic land you control.
3. Float the mana from that basic land and untap it again with the other Eldrazi spawn token.
4. With 2 floating, sacrifice both of the Eldrazi spawn to make 2 more.
5. Use the 4 you just made to again use Spawnsire of Ulamog's ability and repeat the loop.