High powered supports on Hexakill TT
Full AP supports are absolutely a blast to play in this mode.
is a force to be reckoned with, taking half of any non tanks health, healing a low health ally, shielding everyone, speeding up to chase or escape, and stunning at least half the team with her ult.
has heals for days, rains down aoe poke and lays down aoe snares.
bubbles groups of 2 and more (with that good base dmg too), heals while dishing out damage to half the team, gives extra damage and slows, and hits whole teams with her wave.
Those are just my favorite three. I have yet to try out others, but I have high expectations.