Phyrexian Altar + Stalwart Successor + Trapjaw Kelpie

BGU identity

Commander legal

The 3 combo pieces

• Phyrexian Altar
• Stalwart Successor
• Trapjaw Kelpie

How to execute it

1. Activate Phyrexian Altar 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. When Trapjaw Kelpie enters, Stalwart Successor triggers, putting a +1/+1 counter on Trapjaw Kelpie
4. Repeat.

What the combo produces

• Infinite colored mana
• Infinite creature LTB
• Infinite death triggers
• Infinite ETB
• Infinite sacrifice triggers