Chittering Rats

When Chittering Rats enters, target opponent puts a card from their hand on top of their library.

Duress

Target opponent reveals their hand. You choose a noncreature, nonland card from it. That player discards that card.

Rat Colony gets +1/+0 for each other Rat you control.
A deck can have any number of cards named Rat Colony.

As an additional cost to cast this spell, sacrifice a creature.
Draw two cards.

When this creature enters, each opponent discards a card.

Put any number of target creature cards from your graveyard on top of your library.
Draw a card.