Quarry Colossus
Creature — Giant
Oracle Text
When this creature enters, put target creature into its owner's library just beneath the top X cards of that library, where X is the number of Plains you control.Rulings (3)
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Wizards of the CoastQuarry Colossus's ability is mandatory. If you control the only creatures when that ability triggers, you must choose a creature you control (which could be Quarry Colossus itself) as the target.
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Wizards of the CoastIf there are fewer than X cards in that player's library, put the creature on the bottom of that library.
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Wizards of the CoastThe value of X is determined as the ability resolves. If you control no Plains at that time, put the creature on top of that library.