Wastehaven Watcher

Doublestrike, Trample
Whenever a black or white card is played, double
the power of Wastehaven Watcher until the end
of turn.
{w}{w}: skip your next clean up step (the active
player discards down to their maximum hand size,
then simultaneously, all damage marked on
permanents is removed and all until end of turn
and this turn effects end.)