You control at least four creatures without summoning sickness.
Steps
Activate four creatures you control by tapping them, adding ({3} magic symbol) ({R} magic symbol) that can only be spent to cast instant and/or sorcery spells, or to gain a Class level.
Cast
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Seething Anger with buyback by paying ({3} magic symbol) ({R} magic symbol) , triggering
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Jeskai Ascendancy's first and second abilities and
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Sorcerer Class's third ability if it is level three.
Resolve the
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Sorcerer Class trigger, if applicable, causing
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Seething Anger to deal an amount of damage to each opponent equal to the number of instants and sorceries you've cast this turn.
Resolve the first
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Jeskai Ascendancy trigger, giving creatures you control +1/+1 until end of turn and untapping them.
Resolve the second
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Jeskai Ascendancy trigger, allowing you to loot.
Resolve
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Seething Anger, giving a creature you control +3/+0 until end of turn, and returning
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Seething Anger to your hand.
Repeat.
If you control five or more creatures without summoning sickness, this combo nets near-infinite mana.
Results
Infinite draw triggers.
Infinite looting.
Infinite self-discard triggers.
Near-infinite blue mana that can only be spent to cast instant and sorcery spells.
Near-infinite damage.
Near-infinite power and toughness for creatures you control until end of turn.
Near-infinite magecraft triggers.
Near-infinite red mana that can only be spent to cast instant and sorcery spells.
Near-infinite storm count.
Near-infinite untap of creatures you control.
Near-infinite mana creatures you control can produce.