Resonance Reactor

{2}: If the two mana spent to activate this ability are allied colors, add X mana of their mutual enemy color to your mana pool, where X is the number of times this ability has been played this turn.
"Align the mana flows so that the troughs of one's waveform meet the crests of the other's, and fire this through two perpendicular half-silvered mirrors, and... well, it just works; we don't really know why."