Numa, Joraga Chieftain + Sage of Hours + Xenograft

Numa, Joraga Chieftain

Sage of Hours

Xenograft

How it works

1. At the beginning of your combat phase, Numa triggers, causing you to pay 10 to put five +1/+1 counters on Sage of Hours.
2. Activate Sage of Hours by removing all +1/+1 counters from it, causing you to take an extra turn after this one.
3. Repeat each turn.