Kain, The Sloth Sin

Intimidate
As long as you control 5 or more black
permanents, Kain has +0/+2 and deathtouch.
{b/g}{b/g}: Tap target creature you control. That
creature fights another target you don't control.
If this is the third time this ability has been
activated this turn, sacrifice Kain, The Sloth Sin.