Koma's Coil

This creature gets +1/+1 for each other Rat you control.

Eldrazi

Lifelink (Damage dealt by this creature also causes you to gain that much life.)

This creature's power and toughness are each equal to the number of lands you control.

Changeling (This token is every creature type.)

This creature gets +1/+1 for each artifact you control.

This creature's power and toughness are each equal to the number of Spirits you control.