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'When this creature enters, you may pay 2 life. When you do, target creature gets -1/-1 until end of turn.
'Vigilance
Other creatures you control get +2/+2.
Creatures your opponents control get -2/-2.
'Flying Echo {2}{B} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)...
'When this creature enters, choose one — • Return target creature card from your graveyard to your hand. • Target opponent reveals their hand. You choose a noncreature card from...
'Target player draws three cards, loses 3 life, and gets three poison counters.
'When this creature enters, exile it unless you discard a creature card.
When this creature dies, exile it and return target creature card from your graveyard to the battlefield.
'Psychosis Crawler's power and toughness are each equal to the number of cards in your hand.
Whenever you draw a card, each opponent loses 1 life.
'This creature gets +1/+0 for each other Rat you control.
A deck can have any number of cards named Rat Colony.
'Psychosis Crawler's power and toughness are each equal to the number of cards in your hand.
Whenever you draw a card, each opponent loses 1 life.
'When this creature enters, you draw a card and you lose 1 life. Unearth {3}{B} ({3}{B}: Return this card from your graveyard to the battlefield. It gains haste. Exile it...
'Trample Toxic 1 (Players dealt combat damage by this creature also get a poison counter.) Whenever this creature deals combat damage to a player, proliferate. (Choose any number of permanents...
'At the beginning of your upkeep, this creature deals 1 damage to each creature and each player. When this creature dies, it deals 1 damage to each creature and each...