Kykar, Wind's Fury + Vadrok, Apex of Thunder + Snap + Cackling Counterpart
Other: Cast a subset of spells in your graveyard, Infinite creature tokens, Infinite death triggers, Infinite ETB, Infinite LTB, Infinite magecraft triggers, Infinite red mana, Infinite sacrifice triggers, Infinite storm count, Infinite mana lands you control can produce, Infinite untap of lands you control
Activate two lands you control by tapping them, adding at least {1}{W/U}.
Cast Vadrok either from your hand or from the command zone for its mutate cost by paying {1}{W/U}{R}{R} and commander tax, if applicable, putting it under any other nonlegendary non-Human creature you control.
Vadrok triggers, casting Cackling Counterpart from your graveyard without paying its mana cost.
Kykar triggers, creating a 1/1 Spirit creature token.
Resolve Cackling Counterpart, creating a copy of the Vadrok mutated creature.
Activate Kykar by sacrificing a Spirit, adding {R}.
Cast Snap by paying {1}{U}.
Kykar triggers, creating a 1/1 Spirit creature token.
Resolve Snap, returning the mutated creature that contains the nontoken Vadrok from the battlefield to your hand and untapping two lands that can tap to produce at least {1}{W/U}.
Activate Kykar by sacrificing a Spirit, adding {R}.
Activate two lands you control by tapping them, adding at least {1}{W/U}.
Cast Vadrok for its mutate cost by paying {1}{W/U}{R}{R}, putting it under the token Vadrok mutated creature.
The nontoken and token Vadrok each trigger.
Resolve the nontoken Vadrok trigger, casting Cackling Counterpart from your graveyard without paying its mana cost.
Kykar triggers, creating a 1/1 Spirit creature token.
Resolve Cackling Counterpart, creating a copy of the Vadrok mutated creature.
Resolve the token Vadrok trigger from step 13, casting Snap from your graveyard without paying its mana cost.
Kykar triggers, creating a 1/1 Spirit creature token.
Resolve Snap, returning the mutated creature that contains the nontoken Vadrok from the battlefield to your hand and untapping two lands that can tap to produce at least {1}{W/U}.
Activate Kykar twice by sacrificing two Spirits, adding {R}{R}.
Repeat from step 12.
With each iteration, you will gain an additional Vadrok trigger, which you can use to cast any other noncreature spells with mana value three or less in your graveyard, and create infinite Spirit tokens due to Kykar.
Cards: Kykar, Wind's Fury, Vadrok, Apex of Thunder, Snap, Cackling Counterpart