Overkill

, Sacrifice a creature: This artifact deals 1 damage to any target. Whenever a creature enters, you may untap this artifact.

Whenever a creature token leaves the battlefield, put a +1/+1 counter on this creature. , Remove a +1/+1 counter from this creature: Create two 1/1 white Spirit creature tokens with flying.

Whenever a creature enters, that creature's controller may have it deal damage equal to its power to any target of their choice.

Equipped creature has ", : This creature deals 1 damage to any target" and "Whenever a creature dies, untap this creature." Whenever a Shaman creature enters, you may attach this Equipment to it. Equip

Enchant creature Enchanted creature has ": Create X 1/1 red Elemental creature tokens with haste, where X is this creature's power. Exile them at the beginning of the next end step."