Solemnity, and Fallen Ideal

Prerequisites

• Solemnity on the battlefield
• Fallen Ideal on the battlefield
• If a persist creature is used, it does not have a -1/-1 counter on it
• Otherwise, if an undying creature is used, it does not have a +1/+1 counter on it

Steps

1. Activate Fallen Ideal by sacrificing the persist or undying creature
2. When the creature dies, its persist or undying ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter or a +1/+1 counter on it due to Solemnity
3. Resolve the Fallen Ideal ability, giving the creature it is attached to +2/+1 until end of turn
4. Repeat

Results

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