Chatterfang, Squirrel General + Cloudstone Curio + Resolute Reinforcements + Phyrexian Altar

Chatterfang, Squirrel General

Cloudstone Curio

Resolute Reinforcements

Phyrexian Altar

How it works

1. Cast Resolute Reinforcements by paying 1.
2. When Resolute Reinforcements enters the battlefield, it and Cloudstone Curio trigger.
3. Resolve the Cloudstone Curio trigger, choosing to return nothing to your hand from the battlefield.
4. Resolve the Resolute Reinforcements trigger, creating a 1/1 Squirrel and a 1/1 Soldier creature token.
5. When the Soldier and Squirrel enter the battlefield, Cloudstone Curio triggers twice.
6. Resolve the first trigger, returning Resolute Reinforcements to your hand from the battlefield.
7. Resolve the second trigger, choosing to return nothing to your hand from the battlefield.
8. Activate Phyrexian Altar twice by sacrificing the Soldier and Squirrel, adding 1.
9. Repeat.