Relentless Assault + Helm of the Host + Nature's Will + Vampire Charmseeker
Relentless Assault
Helm of the Host
Nature's Will
Vampire Charmseeker
Infinite creature ETBInfinite storm countInfinite combat phasesInfinite mana lands you control can produceInfinite creature tokens with hasteInfinite magecraft triggersInfinite combat damageInfinite 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 Vampire Charmseeker with haste.
When the Vampire Charmseeker 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.