Jeskai Ascendancy + Sorcerer Class + Seething Anger
Jeskai Ascendancy
Sorcerer Class
Seething Anger
Infinite draw triggersInfinite lootingInfinite self-discard triggersNear-infinite blue mana that can only be spent to cast instant and/or sorcery spellsNear-infinite damageNear-infinitely large creatures until end of turnNear-infinite magecraft triggersNear-infinite red mana that can only be spent to cast instant and/or sorcery spellsNear-infinite storm countNear-infinite untap of creatures you controlNear-infinite mana creatures you control can produce
How it works
Activate four creatures you control by tapping them, adding 3 that can only be spent to cast instant and/or sorcery spells, or to gain a Class level.
Cast Seething Anger with buyback by paying 3, triggering Jeskai Ascendancy's first and second abilities and Sorcerer Class's third ability if it is level three.
Resolve the Sorcerer Class trigger, if applicable, causing 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 Jeskai Ascendancy trigger, giving creatures you control +1/+1 until end of turn and untapping them.
Resolve the second Jeskai Ascendancy trigger, allowing you to loot.
Resolve Seething Anger, giving a creature you control +3/+0 until end of turn, and returning Seething Anger to your hand.
Repeat.
If you control five or more creatures without summoning sickness, this combo nets near-infinite mana.