Nadir Kraken, Dire Undercurrents, and Phyrexian Altar

Prerequisites

• Nadir Kraken on the battlefield
• Dire Undercurrents on the battlefield
• Phyrexian Altar on the battlefield
• You have a way to draw a card
• available

Steps

1. Draw a card
2. Nadir Kraken triggers, causing you to pay to put a +1/+1 counter on Nadir Kraken and create a 1/1 Tentacle creature token
3. The Tentacle enters the battlefield, triggering Dire Undercurrents' first ability
4. Holding priority, activate Phyrexian Altar by sacrificing the Tentacle, adding
5. Resolve the Dire Undercurrents trigger, causing you to draw a card
6. Repeat from step 2

Results

• Infinite card draw
• Infinite draw triggers
• Near-infinite +1/+1 counters on Nadir Kraken
• Near-infinite death triggers
• Near-infinite ETB
• Near-infinite LTB
• Near-infinite sacrifice triggers