Lightning Storm + Stormchaser Drake + Wheel of Sun and Moon + Abundance + Sakashima of a Thousand Faces
Lightning Storm
Stormchaser Drake
Wheel of Sun and Moon
Abundance
Sakashima of a Thousand Faces
Infinite self-discard triggersInfinite damage to one opponent
How it works
Cast Lightning Storm by paying 1, targeting either copy of Stormchaser Drake.
Stormchaser Drake triggers, which due to Abundance causes you to reveal cards from the top of your library until you reveal a land card and put it into your hand.
Activate Lightning Storm by discarding a land card, putting that land card on the bottom of your library due to Wheel of Sun and Moon.
Resolve the Lightning Storm ability, putting two charge counters on it and changing the target to the other copy of Stormchaser Drake.
Repeat from step 2.
Once Lightning Storm has an arbitrarily large number of charge counters, activate it by discarding a land to change its target to any other target of your choosing to deal infinite damage to that target.
This clever loop begins by casting Lightning Storm, targeting one of your two Stormchaser Drakes, which are safely free of the legend rule thanks to Sakashima of a Thousand Faces. Whenever you target your Drake, its ability normally draws you a card, but Wheel of Sun and Moon and Abundance work together to turn that draw into a guaranteed land-to-hand tutor while recycling discarded lands directly to the bottom of your library. You can then immediately discard that retrieved land to Lightning Storm's activated ability, pumping its charge counters and redirecting the spell to your other Stormchaser Drake. By bouncing the spell back and forth between your two Drakes and fueling the costs with your endlessly recycling lands, you grow Lightning Storm to an arbitrarily large size before finally pointing it at an opponent for the win.