Elesh Norn, Mother of Machines

Other creatures you control get -1/-1. 1BB, T: Return target creature card from your graveyard to the battlefield. It gains "If this creature would leave the battlefield, exile it instead of putting it anywhere else." Activate only as a sorcery.

Toxic 1 (Players dealt combat damage by this creature also get a poison counter.) Other Rats you control have toxic 1. When Karumonix enters, look at the top five cards of your library. You may reveal any number of Rat cards from among them and put the revealed cards into your hand. Put the rest on the bottom of your library in a random order.

Permanent cards in graveyards can't enter the battlefield. Players can't cast noncreature spells from graveyards or exile.

Toxic 1 (Players dealt combat damage by this creature also get a poison counter.) Other Rats you control have toxic 1. When Karumonix enters, look at the top five cards of your library. You may reveal any number of Rat cards from among them and put the revealed cards into your hand. Put the rest on the bottom of your library in a random order.

At the beginning of your upkeep, you draw a card and you lose 1 life.

At the beginning of your upkeep, you draw a card and you lose 1 life.

Trample Whenever a source deals damage to this creature, that source's controller sacrifices that many permanents of their choice.

Trample Whenever a source deals damage to this creature, that source's controller sacrifices that many permanents of their choice.