Sage of Hours + Shimmerwing Chimera + Awakened Awareness

Sage of Hours

Shimmerwing Chimera

Awakened Awareness

How it works

1. Cast Awakened Awareness for X=4 by paying 4.
2. Sage of Hours triggers, putting a +1/+1 counter on itself.
3. Awakened Awareness enters the battlefield, putting four +1/+1 counters on Sage of Hours.
4. Activate Sage of Hours by removing all +1/+1 counters from it, causing you to take at least one extra turn after this one.
5. At the beginning of your next extra turn's upkeep, Shimmerwing Chimera triggers, causing you to return Awakened Awareness from the battlefield to your hand.
6. Repeat.