It forces each opponent to sacrifice a non-land permanent when attacking, and gains 2 +1/+1 counters each time one of your artifacts enters the graveyard or exile from play
turn, completely overwhelming the opponent's early-game setup and turning the board into an offensive sweep
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If not dealt with swiftly, Ulamog will run away with the game, either destroying your opponent's life total, as a 10/10 Indestructible creature, or milling them out with its ability
Tax treatment : Collectibles often face higher capital gains taxes than equities, reducing net returns
The most traditional or old school Rat that was known for doing this was Ravenous Rats