Requires

Calix, Guided by Fate must be on the battlefield. Scurry Oak must be on the battlefield. Rancor must be in hand. Phyrexian Altar must be on the battlefield. You control at least one additional creature. Mana needed:

Steps

1. Cast Rancor by paying , attaching it to any other creature you control.
2. When Rancor enters the battlefield, Calix's first ability triggers, putting a +1/+1 counter on Scurry Oak.
3. Scurry Oak triggers, creating a 1/1 Squirrel creature token.
4. Activate Phyrexian Altar by sacrificing the creature with Rancor attached, adding .
5. Rancor triggers, returning it from your graveyard to your hand.
6. Repeat.

Results