I think Void, with solar a close second. Assuming all start with super charged, Titans pop bubble that GG destroys, but orb generation makes it so they pop another immediately. Void bows pop out of bubble and lock enemy forces in place, then Nova bombs with bloom and annihilate just decimate everything. Arc would never get close, solar would be tough with self res, GG and hammer, but with all the bubbles and void bows, plus orbs generated by nova bombs, it wouldn't matter. Edit: Someone who is immensely more skilled and creative than I, should really make a cool video of this.