Razorfield Ripper (M3C-094) - Modern Horizons 3 Commander

Whenever this creature or equipped creature attacks, you get (an energy counter), then it gets +X/+X until end of turn, where X is the amount of you have.
Reconfigure—Pay {2} or . (Pay {2} or : Attach to target creature you control; or unattach from a creature. Reconfigure only as a sorcery. While attached, this isn't a creature.)