Grenzo, Dungeon Warden, Ashnod's Altar, and Zask, Skittering Swarmlord

Prerequisites

• Grenzo, Dungeon Warden on the battlefield
• Ashnod's Altar on the battlefield
• Zask, Skittering Swarmlord on the battlefield
• You control at least one nontoken Insect
• Grenzo has power equal to or greater than the Insect's base power

Steps

1. Activate Ashnod's Altar by sacrificing the Insect, adding
2. When the Insect dies, Zask's first ability triggers, causing you to put the Insect on the bottom of your library from your graveyard
3. Activate Grenzo by paying , putting the Insect into your graveyard from the bottom of your library, and then putting it onto the battlefield
4. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers