Grenzo, Dungeon Warden, The Cauldron of Eternity, Phyrexian Altar, Dark Ritual, and Timeless Witness

Prerequisites

• Grenzo, Dungeon Warden on the battlefield
• The Cauldron of Eternity on the battlefield
• Phyrexian Altar on the battlefield
• Dark Ritual in hand
• Timeless Witness on the battlefield
• Grenzo has power 2 or greater
• available

Steps

1. Cast Dark Ritual by paying , adding
2. Activate Phyrexian Altar by sacrificing Timeless Witness, adding one mana of any color
3. When Timeless Witness dies, The Cauldron of Eternity triggers, putting Timeless Witness from your graveyard onto the bottom of your library
4. Activate Grenzo by paying , putting Timeless Witness from the bottom of your library into your graveyard, and then putting it onto the battlefield
5. When Timeless Witness enters the battlefield, it triggers, returning Dark Ritual from your graveyard to your hand
6. Repeat
7. Once you have infinite mana, you may activate Grenzo's ability any number of times

Results

• Infinite LTB
• Infinite ETB
• Infinite colored mana
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite storm count
• Infinite magecraft triggers
• Put all creature cards with power less than or equal to Grenzo's from your library onto the battlefield