Typhoid Rats

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

Child of Night

Whenever Audacious Thief attacks, you draw a card and you lose 1 life.

When Ravenous Rats enters, target opponent discards a card.

Until end of turn, target creature gets +2/+0 and gains "When this creature dies, return it to the battlefield tapped under its owner's control."

When Phyrexian Rager enters, you draw a card and you lose 1 life.

When Phyrexian Gargantua enters, you draw two cards and you lose 2 life.

When Gravedigger enters, you may return target creature card from your graveyard to your hand.

Target player draws two cards and loses 2 life.

Flying
When Bloodhunter Bat enters, target player loses 2 life and you gain 2 life.