Harley Quinn

Haste

{u}{b}, {t}: Gain control of target creature until end
of turn. Untap that creature. It gains haste until end
of turn.
{1}{u}{b}: Harley Quinn deals 2 damage to any target.
Partner with Poison Ivy (When this creature enters
the battlefield, you may search your library for a
card named Poison Ivy, reveal it, put it into your
hand, then shuffle.)