Dragonspark Reactor

Whenever this artifact or another artifact you control enters, put a charge counter on this artifact. {4}, Sacrifice this artifact: It deals damage equal to the number of charge counters on it to target player and that much damage to up to one target creature.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6oc0gp88e1pb1het8bz179.