Grindstone

Artifact    (CMC:1)

, : Put the top two cards of target player's library into that player's graveyard. If both cards share at least one color, repeat this process.

"Memory is a burden that wears at the soul as weather wears at stone." —Crovax

TE • ENGreg Simanson

™ & © 1993—1997 Wizards of the Coast

Legal in: Tempest Block,Legacy,Vintage,Commander

Oracle Text (click to copy):

Grindstone {1} Artifact {3}, {T}: Target player puts the top two cards of his or her library into his or her graveyard. If both cards share a color, repeat this process.

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View this MTG card on Gatherer

10/4/2004
If the two cards are both colorless, then the effect does not repeat. It only repeats if both cards have at least one color and at least one color is shared between them.
10/4/2004
The effect repeats as many times as it takes to meet the end condition.

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Card Grindstone is not on TCGPlayer.