Infinite creature LTBInfinite creature ETBInfinite damageInfinite storm countInfinite mana creatures you control can produceInfinite untap of creatures
How it works
Cast Sparkcaster by tapping a number of creatures and paying 0.
When Sparkcaster enters the battlefield, its first and second abilities and Intruder Alarm trigger.
Resolve the first Sparkcaster trigger, returning it from the battlefield to your hand.
Resolve the second Sparkcaster trigger, dealing 1 damage to a player.
Resolve the Intruder Alarm trigger, untapping all creatures.