r/place

At the beginning of your upkeep, put a unity counter on r/place. Whenever a five-color permanent enters the battlefield under your control, put five unity counters on r/place.
{ut}: Remove two unity counters from r/place. Only any opponent may activate this ability.
{t}: Add X mana in any combination of colors to your mana pool, where X is the amount of unity counters on r/place.