Bloodflow Connoisseur + Hardened Academic + Trapjaw Kelpie

WUBRG identity

Commander legal

The 3 combo pieces

• Bloodflow Connoisseur
• Hardened Academic
• Trapjaw Kelpie

How to execute it

1. Activate Bloodflow Connoisseur 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 Bloodflow Connoisseur ability.
5. Repeat.

What the combo produces

• Infinite +1/+1 counters on a creature
• Infinite creature LTB
• Infinite death triggers
• Infinite ETB
• Infinite sacrifice triggers