Ruin Rat

Deathtouch
When Ruin Rat dies, exile target card from an opponent's graveyard.

Island

Divest

Target player reveals their hand. You choose an artifact or creature card from it. That player discards that card.

Rescue

Return target permanent you control to its owner's hand.

Divination

Arcane Flight

Enchant creature
Enchanted creature gets +1/+1 and has flying.

Deep Freeze

Enchant creature
Enchanted creature has base power and toughness 0/4, has defender, loses all other abilities, and is a blue Wall in addition to its other colors and types.

Swamp

Feral Abomination

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

Tetsuko Umezawa, Fugitive

Creatures you control with power or toughness 1 or less can't be blocked.

Rat Colony

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

Cast Down

Demonic Vigor

Enchant creature
Enchanted creature gets +1/+1.
When enchanted creature dies, return that card to its owner's hand.

Blessing of Belzenlok

Target creature gets +2/+1 until end of turn. If it's legendary, it also gains lifelink until end of turn.