Deacon Drumrunner

Flash, haste.
When Deacon Drumrunner enters the battlefield you may counter target spell and add X mana in any combination of colors to your mana pool where X is that spell's converted mana cost.
Deacon Drumrunner costs {1} less to cast for every Gate permanent you control.
{u/r}{u/b}{g/u}: Return Deacon Drumrunner to its owner's hand.