Task Force + Animal Boneyard + Soltari Guerrillas

Task Force

Animal Boneyard

Soltari Guerrillas

How it works

1. Activate Soltari Guerrillas by paying 0.
2. Task Force triggers, giving it +0/+3 until end of turn.
3. Repeat an arbitrarily large number of times.
4. Activate the land with Animal Boneyard attached by tapping it and sacrificing Task Force, causing you to gain life equal to Task Force's toughness.