The List

Grab the Reins

Choose one —
• Until end of turn, you gain control of target creature and it gains haste.
• Sacrifice a creature. Grab the Reins deals damage equal to that creature's power to any target.
Entwine {2}{R} (Choose both if you pay the entwine cost.)

Commander 2016

Choose one —
• Until end of turn, you gain control of target creature and it gains haste.
• Sacrifice a creature. Grab the Reins deals damage equal to that creature's power to target creature or player.
Entwine {2}{R} (Choose both if you pay the entwine cost.)

Mirrodin

Choose one Until end of turn, you gain control of target creature and it gains haste; or sacrifice a creature, then Grab the Reins deals damage equal to that creature's power to target creature or player.
Entwine {2}{R} (Choose both if you pay the entwine cost.)