Razorfield Ripper

Whenever this creature or equipped creature attacks, you get E (an energy counter), then it gets +X/+X until end of turn, where X is the amount of E you have.

Reconfigure—Pay 2 or EEE. (Pay 2 or EEE: Attach to target creature you control; or unattach from a creature. Reconfigure only as a sorcery. While attached, this isn't a creature.)