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: Add 
to your mana pool.
| Oracle text |
| Grim Vault {} |Land| Grim Vault enters the battlefield tapped. / Tap: Add G to your mana pool. Sacrifice Grim Vault: Add GG to your mana pool. / G, Return a Forest to your hand: Grim Vault deals damage to target player equal to the number of monocolored permanents you control. |