Thrax

Flash, Haste
Whenever Thrax attacks, roll a d20
On a 1-5, nothing happens.
On a 6-10, you gain control of a target creature an opponent controls.
That creature is tapped and attacking.
On an 11-15, you gain control of up to two target creatures in this way.
On a 16-20, you gain control of up to three target creatures in this way.