Elfdon, Wandering Trader

Elfdon, Wandering Trader can't be countered.
{t}, {1}{w}{u}: Create a 1/1 white and blue human
creature token with "When this creature enters
the battlefield, target opponent gains control of
it, then, you gain control of target creature that
opponent controls."
Target opponent can't cast spells that have the
same name as permanents you control.