The Rat King

When casting The Rat King, sacrifice any number of Rat Creatures, The Rat King has power and toughness equal to the number of Rat Creatures sacrificed this way

When this card is cast from anywhere, you become the Monarch.

Rat Creatures under your control have Lifelink

Sacrifice a Rat Creature to add a +1/+1 counter on The Rat King

Partner with Brood Mother