Elemental Vortex

At the beginning of each opponent's upkeep, you
may return a creature they control to its owner's
hand. If you don't, you gain {e}.
{e}: Return target non-land, non-creature
permanent to its owner's hand.
{e}{e}: Gain control of target creature until end of
turn.
{e}{e}{e}: Add 5 mana of any combination of
colors or colorless to your mana pool. You can
only use this ability once per turn.