Phyrexian Altar + Symmetry Matrix + The Watcher in the Water

U identity

Commander legal

The 3 combo pieces

• Phyrexian Altar
• Symmetry Matrix
• The Watcher in the Water

What must be in place

You have a way to draw a card during an opponent's turn.

How to execute it

1. Draw a card during an opponent's turn.
2. The Watcher's first ability riggers, creating a 1/1 Tentacle creature token.
3. When the Tentacle enters the battlefield, Symmetry Matrix triggers.
4. Holding priority, activate Phyrexian Altar by sacrificing the Tentacle, adding {1}.
5. When the Tentacle dies, The Watcher's second ability triggers, untapping up to one Kraken you control.
6. Resolve the Symmetry Matrix trigger, causing you to pay {1} to draw a card.
7. Repeat from step 2.

What the combo produces

• Infinite card draw
• Infinite draw triggers
• Near-infinite creature sacrifice triggers
• Near-infinite death triggers
• Near-infinite ETB
• Near-infinite LTB
• Near-infinite untap of some creatures you control