I think this is a little OP. 3 rounds of perm control for only 4 random quanta is very cheap, and it is very immune to cc. Any damaging spells will just extend it's life, and reverse time will return to the user's hand, granting even more perm control. Gravity pulling it could backfire if you cannot kill it quickly enough and give even more free pc. The only way to stop it relaiby is freeze or basilisk blood, and that just increases the lobbing power when used in a trebuchet. Mutation could work, but people hardly use unupped druids so you risk giving your opoment a powerful mutant.
AND on top of that, it gives an unupped black hole in to your opoment's hand when it's done.