Overclocked Electromancer (Extended Art)

At the beginning of combat on your turn, you may pay . If you do, put a +1/+1 counter on Overclocked Electromancer. Whenever Overclocked Electromancer attacks, double its power until end of turn. Whenever Overclocked Electromancer deals combat damage to a creature, if that creature was dealt excess damage this turn, you get X , where X is that excess damage.