Yawgmoth, Thran Physician + Scurry Oak + Moonlit Wake

Yawgmoth, Thran Physician

Scurry Oak

Moonlit Wake

How it works

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

This loop turns Scurry Oak and Yawgmoth, Thran Physician into a self-sustaining engine by playing the +1/+1 counters from Scurry Oak's evolve ability against the -1/+1 counter cancellation rules, constantly generating fresh 1/1 green Squirrel creature tokens to sacrifice to Yawgmoth's activated ability. Because Yawgmoth demands a creature sacrifice and 1 life as a cost while drawing you a card, Moonlit Wake neatly cushions that life payment by netting you 1 life every time a creature dies. The result is a brilliantly closed loop that lets you draw as many cards as you need while churning through your entire deck.