Kiyoshi, the Corrupted

Whenever Kiyoshi would deal damage to another
creature, you may pay {1}{u}{b}. If you do, gain
control of that creature instead.
{3}{u}{b}, {t}: Gain control of target creature or planeswalker unless its controller pays 2 life and discards 2 cards.

"I embody the darkness of man, of society, and especially of heroes. I am Corruption."