Yawgmoth, Thran Physician + Scurry Oak + Auriok Champion

Yawgmoth, Thran Physician

Scurry Oak

Auriok Champion

How it works

1. Cast Yawgmoth by paying 2.
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.

This engine creates a closed-loop recycling system centered around Yawgmoth, Thran Physician, using his sacrifice outlet and life payment to fuel your card draw while completely mitigating the life cost through Auriok Champion's constant healing triggers whenever creatures enter. Meanwhile, Scurry Oak acts as our infinite token producer and counter sink: whenever it takes a -1/-1 counter from Yawgmoth, the ensuing +1/+1 counters from its evolve ability and native triggers create fresh 1/1 Squirrel tokens to be sacrificed right back to Yawgmoth. As long as you have enough life to kickstart the chain, this triumvirate lets you draw through your entire deck while generating boundless death and entry triggers.