Uragiri, Cicera's Advisor

First strike, Trample, Corrupt (This creature deals damage in the form of corruption counters. Whenever a corruption counter is placed on a creature or planeswalker, if that creature or planeswalker has five
or more corruption counters, gain control of it.
Whenever a player gets a corruption counter, if that
player has fifteen corruption counters, remove all corruption counters from
that player and you control that player during their
next turn.)