Phyrexian Altar, Furystoke Giant, and Hardened Academic

Prerequisites

• Phyrexian Altar on the battlefield
• Furystoke Giant on the battlefield
• Hardened Academic on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Furystoke Giant
2. When Furystoke Giant 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 Furystoke Giant
4. Repeat

Results

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