Causuia Nest

Causuia Nest enters tapped

{t}: Add {u} or {b}

{x}{x},{t}: Put X brood counters on Causuia Nest.

Whenever a lizard or rat enters under your control if there are at least five brood counters on Causuia Nest create a token that's a copy of that creature.

Once a colony reaches a certain size they become nearly impossible to dislodge.