Druids' Repository

Enchantment    (CMC:3)

Whenever a creature you control attacks, put a charge counter on Druids' Repository. Remove a charge counter from Druids' Repository: Add one mana of any color to your mana pool.

176 AVR • ENDaarken

™ & © 1993—2012 Wizards of the Coast

Legal in: Modern,Extended,Innistrad Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Tribal Wars Standard,Classic,Singleton 100,Commander

Oracle Text (click to copy):

Druids' Repository {1}{G}{G} Enchantment Whenever a creature you control attacks, put a charge counter on Druids' Repository. Remove a charge counter from Druids' Repository: Add one mana of any color to your mana pool.

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5/1/2012
The first ability of Druids' Repository will trigger once for each creature you control that attacks.
5/1/2012
You can activate the second ability of Druids' Repository multiple times in the same turn. It's a mana ability, doesn't use the stack, and can't be responded to.

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Card Druids' Repository is not on TCGPlayer.