Hardened Academic + Trapjaw Kelpie + Umbral Collar Zealot

WUBRG identity

Commander legal

The 3 combo pieces

• Hardened Academic
• Trapjaw Kelpie
• Umbral Collar Zealot

How to execute it

1. Activate Umbral Collar Zealot by sacrificing Trapjaw Kelpie.
2. When Trapjaw Kelpie dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. Hardened Academic triggers, putting a +1/+1 counter on Trapjaw Kelpie.
4. Resolve the Umbral Collar Zealot ability.
5. Repeat.

What the combo produces

• Infinite creature LTB
• Infinite death triggers
• Infinite ETB
• Infinite sacrifice triggers
• Infinite surveil