The Lone Rider

Dethrone, Shroud, Convoke, Myriad & Horsemanship

You may cast this for {4} (this doesn't include Commander Tax) & it gains Haste, but on your endstep you roll a D20.
1-6= You must exile this creature & you lose 4 life.
7-16= Give control of this creature to a random opponent.
On that players endstep they must exile this creature.
17-20= You may return this creature to the top of your library or sacrifice this creature to Take The Initiative.

When this creature deals combat damage to an
oppone