Stalwart Successor, Phyrexian Altar, and Lesser Masticore

Prerequisites

• Stalwart Successor on the battlefield
• Phyrexian Altar on the battlefield
• Lesser Masticore on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Lesser Masticore When Lesser Masticore dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
2. When Lesser Masticore enters, Stalwart Successor triggers, putting a +1/+1 counter on Lesser Masticore Repeat

Results

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