Curator Beastie, Lesser Masticore, and Sarcatog

Prerequisites

• Curator Beastie on the battlefield
• Lesser Masticore on the battlefield
• Sarcatog on the battlefield
• Lesser Masticore does not have a -1/-1 counter on it

Steps

1. Activate Sarcatog's second ability 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 due to Curator Beastie
3. Resolve the Sarcatog ability, giving it +1/+1 until end of turn
4. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinitely large Sarcatog until end of turn