Tyvar Kell, Cloudstone Curio, Doubling Season, Llanowar Elves, and Elvish Mystic

Prerequisites

• Tyvar Kell on the battlefield
• Cloudstone Curio on the battlefield
• Doubling Season on the battlefield
• Llanowar Elves on the battlefield
• Elvish Mystic in hand
• Tyvar and available

Steps

1. Cast Tyvar by paying , which enters with six loyalty counters due to Doubling Season
2. Activate Tyvar's third loyalty ability by removing six loyalty counters from it
3. Tyvar dies as a state-based action due to having zero loyalty
4. Resolve the Tyvar ability, causing you to get an emblem
5. Cast Elvish Mystic by paying
6. Tyvar's emblem triggers, causing the Elvish Mystic spell to gain haste, and you to draw two cards
7. Elvish Mystic enters the battlefield, triggering Cloudstone Curio, returning Llanowar Elves from the battlefield to your hand
8. Activate Elvish Mystic by tapping it, adding
9. Cast Llanowar Elves by paying
10. Tyvar's emblem triggers, causing the Llanowar Elves spell to gain haste, and you to draw two cards
11. Llanowar Elves enters the battlefield, triggering Cloudstone Curio, returning Elvish Mystic from the battlefield to your hand
12. Activate Llanowar Elves by tapping it, adding
13. Repeat from step 5

Results

• Infinite card draw
• Infinite draw triggers
• Near-infinite ETB
• Near-infinite LTB
• Near-infinite storm count