Emry, Lurker of the Loch, Urza, Lord High Artificer, Mirran Spy, Aether Spellbomb, and Kykar, Wind's Fury

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
• Kykar, Wind's Fury on the battlefield
• available

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 Mirran Spy and Kykar trigger
3. Resolve the Mirran Spy, untapping Emry
4. Resolve the Kykar trigger, creating a 1/1 Spirit creature token
5. Activate Kykar by sacrificing the Spirit token, adding
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
• Near-infinite ETB
• Infinite draw triggers
• Near-infinite storm count
• Near-infinite LTB
• Near-infinite death triggers
• Near-infinite sacrifice triggers
• Return any number of creatures to their owners' hands