Phyrexian Altar, Lesser Masticore, and Hardened Academic

Prerequisites

• Phyrexian Altar on the battlefield
• Lesser Masticore on the battlefield
• Hardened Academic on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Lesser Masticore
2. When Lesser Masticore 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 Lesser Masticore
4. Repeat

Results

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