Grenzo, Dungeon Warden, Ashnod's Altar, and Wheel of Sun and Moon

Prerequisites

• Grenzo, Dungeon Warden on the battlefield
• Ashnod's Altar on the battlefield
• Wheel of Sun and Moon on the battlefield
• You control at least one additional nontoken creature
• Grenzo has power equal to or greater than the additional creature's base power

Steps

1. Activate Ashnod's Altar by sacrificing the additional creature, adding
2. The creature is put on the bottom of your library instead of in your graveyard due to Wheel of Sun and Moon
3. Activate Grenzo by paying , putting the creature into your graveyard from the bottom of your library, and then putting it onto the battlefield
4. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers