junkyo echoes

Whenever a creature enters, you may add an amount of equal to the number of creatures you control that share a creature type with it.

Indestructible (Effects that say "destroy" don't destroy this artifact.) Myr creatures get +1/+1. : Create a 1/1 colorless Myr artifact creature token.

At the beginning of your upkeep, you may have target creature you control get +X/+X until end of turn, where X is the number of creatures you control. If you do, sacrifice that creature at the beginning of the next end step.

: Add . , , Sacrifice a creature: You gain life equal to the sacrificed creature's toughness.