Curator Beastie, Lesser Masticore, and Ashnod's Altar

Prerequisites

• Curator Beastie 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
2. When Lesser Masticore dies, its persist ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it due to Curator Beastie
3. Repeat

Results

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