Ur'Zethig, Tainted Convert

Devoid (This card has no colors.)
Permanents you control have devoid.
{c}{c}{u/r}: Put a toil counter on target nonland permanent. Until end of turn, Ur'Zethig
becomes a copy of that permanent, except it has
devoid.
At the beginning of your upkeep, gain control of
each permanent with 3 or more toil counters.