Ashnod's Altar + Scurry Oak + Tainted Observer

GU identity

Commander legal

The 3 combo pieces

What must be in place

You have a way to cause a creature to enter the battlefield under your control.
Scurry Oak has at least one +1/+1 counter on it.

How to execute it

  1. Cause a creature to enter the battlefield under your control.
  2. When the creature enters the battlefield, Tainted Observer triggers.
  3. Holding priority, activate Ashnod's Altar by sacrificing the creature, adding {C}{C}.
  4. Resolve the Tainted Observer trigger, causing you to pay {2} to put a +1/+1 counter on Scurry Oak.
  5. Scurry Oak triggers, creating a 1/1 Squirrel creature token.
  6. Repeat from step 2.

What the combo produces