Emry, Lurker of the Loch, Urza, Lord High Artificer, Mirran Spy, Aether Spellbomb, and Longshot, Rebel Bowman

Prerequisites

• Emry, Lurker of the Loch on the battlefield
• Urza, Lord High Artificer on the battlefield
• Mirran Spy on the battlefield
• Aether Spellbomb in hand or in the graveyard
• Longshot, Rebel Bowman on the battlefield

Steps

1. If Aether Spellbomb is in your graveyard, activate Emry by tapping it, targeting Aether Spellbomb
2. Cast Aether Spellbomb either from your hand or from your graveyard by paying due to Longshot
3. Mirran Spy and Longshot trigger
4. Resolve the Mirran Spy trigger, untapping Emry
5. Resolve the Longshot trigger, dealing 2 damage to each opponent
6. Activate Urza's first ability by tapping Aether Spellbomb, adding
7. Activate Aether Spellbomb's second ability by paying and sacrificing it, causing you to draw a card
8. Repeat

Results

• Infinite card draw
• Infinite draw triggers
• Near-infinite damage
• Near-infinite storm count
• Return any number of creatures to their owners' hands