Notion Thief + Teferi's Puzzle Box

UB identity

Commander legal

The 2 combo pieces

• Notion Thief
• Teferi's Puzzle Box

How to execute it

1. At the beginning of your opponent's draw step, after they draw their card, Teferi's Puzzle Box triggers, causing them to put the cards in their hand on the bottom of their library, then attempt to draw that many cards.
2. Notion Thief's replacement effect causes you to draw that many cards instead.
3. Repeat on each opponent's draw step.

What the combo produces

• Lock
• Opponents put all cards in hand on the bottom of their library on each of their draw steps