The Legion

Feral Frenzy - Whenever The Legion becomes
blocked, choose up to 4 creatures defending player controls that aren't deep wounded. Those creatures
get a -1/-1 counter and become deep wounded.

Deep Wound - During each opponents upkeep, they
may tap any number of deep wounded creatures.
Those creatures don't untap during their next
untap step. For every deep wounded creature not
tapped this way, add a -1/-1 counter to it.