Nadir Kraken, Phyrexian Altar, and Korvold, Fae-Cursed King

Prerequisites

• All permanents on the battlefield
• You control an additional creature

Steps

1. Activate Phyrexian Altar by sacrificing a creature, adding one mana of any color
2. The creature dies, triggering Korvold, causing you to put a +1/+1 counter on it and drawing you a card
3. Nadir Kraken triggers, causing you to pay to put a +1/+1 counter on it and create a 1/1 Tentacle creature token
4. Repeat

Results

• Infinite card draw
• Infinitely large Nadir Kraken
• Infinite death triggers
• Infinite sacrifice trigger