Surrak and Goreclaw, Lesser Masticore, and Ashnod's Altar

Prerequisites

• Surrak and Goreclaw on the battlefield
• Lesser Masticore on the battlefield
• Ashnod's Altar on the battlefield
• Lesser Masticore does not have a -1/-1 counter on it

Steps

1. Activate Ashnod's Altar by sacrificing Lesser Masticore, adding one mana of any color
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. When Lesser Masticore enters the battlefield, Surrak and Goreclaw triggers, putting a +1/+1 counter on Lesser Masticore and giving it haste until end of turn
4. Repeat

Results

• Infinite colorless mana
• Infinite damage to creatures
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers