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'Vigilance
Other creatures you control get +2/+2.
Creatures your opponents control get -2/-2.
'{T}: Add {C}. If you control an Urza's Mine and an Urza's Tower, add {C}{C} instead.
'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.)...
'{T}: Add {C}.
{1}, {T}, Sacrifice an artifact: You gain 1 life.
'This creature gets +1/+0 for each other Rat you control.
A deck can have any number of cards named Rat Colony.
At the beginning of your upkeep, each player draws a card.
Whenever an opponent draws a card, that player loses 1 life.
'At the beginning of your upkeep, exile the top card of your library. You may play that card this turn. At the beginning of your end step, if you didn't...
'Haste At the beginning of your upkeep, exile the top card of your library. You may play it this turn. At the beginning of each opponent's upkeep, the next time...
'At the beginning of your upkeep, exile the top card of your library. You may play that card this turn. At the beginning of your end step, if you didn't...
'Compleated ({B/P} can be paid with {B} or 2 life. If life was paid, this planeswalker enters with two fewer loyalty counters.) [0]: You draw a card and lose 1...
Flying
Whenever this creature deals combat damage to a player, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)