Kroma, Loam Scuttler

Creatures you control have defender.
Whenever another creature with Toughness
greater than its Power enters the battlefield
under your control, each Player mills an amount
of cards equal to that creatures toughness.
Discard a card: Exile target creature card from a graveyard. Until end of turn, you may play that
card as long as its Toughness is greater than its
Power. you may use any color of mana to cast
that spell.