Crota, Out From the Darkness

Haste, Menace, Deathtouch.
Crota must attack Each turn if able.
At the End of Every Combat Phase, if 5 or more Permanents left the Battlefield during Combat that turn. You may choose a single one of those cards and play it without paying its mana cost. then you may untap all of your Creatures and then you may attack this turn.