Ominous Roost, Marang River Prowler, Animar, Soul of Elements, and Phyrexian Altar

Prerequisites

• Ominous Roost on the battlefield
• Marang River Prowler on the battlefield
• Animar, Soul of Elements on the battlefield
• Phyrexian Altar on the battlefield
• Animar has at least two +1/+1 counters on it

Steps

1. Activate Phyrexian Altar by sacrificing Marang River Prowler, adding
2. Cast Marang River Prowler from your graveyard for
3. Ominous Roost triggers, creating a 1/1 Bird creature token
4. Repeat

Results

• Infinite +1/+1 counters on Animar
• Infinite colored mana
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count