Relentless Assault + Helm of the Host + Nature's Will + Zealous Lorecaster
Relentless Assault
Helm of the Host
Nature's Will
Zealous Lorecaster
Infinite creature ETBInfinite combat damageInfinite combat phasesInfinite creature tokens with hasteInfinite magecraft triggersInfinite mana lands you control can produceInfinite storm countInfinite untap of lands you control
How it works
Activate any number of lands by tapping them, adding at least 2.
Cast Relentless Assault by paying 2, causing you to untap all creatures that attacked this turn and causing you to get an additional combat and main phase after this one.
At the beginning of your combat phase, Helm of the Host triggers, creating a token copy of Zealous Lorecaster with haste.
When the Zealous Lorecaster token enters, it triggers, returning Relentless Assault from your graveyard to your hand.
Deal combat damage to an opponent. Nature's Will triggers, untapping all lands you control.
Move to your next main phase and repeat from step 1.