Cast Electrodominance, choosing X=3, but paying ({R} magic symbol) ({R} magic symbol) due to Vadrik.
Holding priority, cast Reiterate with buyback by paying ({R} magic symbol) ({R} magic symbol) due to Vadrik.
Resolve Reiterate, copying Electrodominance and returning Reiterate to your hand.
Resolve the copy of Electrodominance, dealing 3 damage to any target, and allowing you to pay ({0} magic symbol) to cast Reiterate with buyback due to Electrodominance and Vadrik's cost reductions.