Requires

Yawgmoth, Thran Physician must be in hand. Scurry Oak must be on the battlefield. Auriok Champion must be on the battlefield. You control at least two additional creatures. Scurry Oak has no +1/+1 counters on it. Your life total is at least 2. Mana needed:

Steps

1. Cast Yawgmoth by paying .
2. When Yawgmoth enters the battlefield, Auriok Champion and Scurry Oak's evolve ability trigger.
3. Holding priority, activate Yawgmoth by paying 1 life and sacrificing a creature, putting a -1/-1 counter on Scurry Oak and causing you to draw a card.
4. Resolve the Auriok Champion trigger, causing you to gain 1 life.
5. Resolve the Scurry Oak trigger, putting a +1/+1 counter on it, triggering Scurry Oak's second ability.
6. Holding priority, activate Yawgmoth by paying 1 life and sacrificing a creature, putting a -1/-1 counter on Scurry Oak and causing you to draw a card.
7. Resolve the Scurry Oak trigger, creating a 1/1 Squirrel creature token.
8. When the Squirrel enters the battlefield, Auriok Champion and Scurry Oak's evolve ability trigger.
9. Repeat from step 4.

Results