Anbu black ops strategist

Ninjutsu {1}{u/b}{u/b}{b}
Whenever Anbu black ops strategist deals
combat damage to a player, you may pay
{u}{u}{b}{b}. If you do, that player loses life
equal to the number of ninja villages you
control more than them. If they control no
ninja villages, they must sacrifice a creature.
{u/b}{u/b}{u/b}{u/b}: Gain control of target ninja
village until end of turn.