Crystal Shard + Mnemonic Wall + Walk the Aeons

Mana needed: {6}{U}{U}{U}{U}{U} each turn

U identity

Commander legal

The 3 combo pieces

• Crystal Shard
• Mnemonic Wall
• Walk the Aeons

How to execute it

1. Cast Walk the Aeons by paying {4}{U}{U}, taking an extra turn after this one.
2. Cast Mnemonic Wall by paying {4}{U}.
3. Mnemonic Wall enters the battlefield, returning Walk the Aeons from your graveyard to your hand.
4. Activate Crystal Shard by paying {U} and tapping it, returning Mnemonic Wall from the battlefield to your hand.
5. Repeat each turn.

What the combo produces

• Infinite turns
• Lock