(Plains Forge isn't a spell.)
Plains Forge enters the battlefield tapped unless you pay 3 life.
: Target player exiles a card from his or her graveyard.
: Add to your mana pool. If you played a land this turn, Add to your mana pool instead.
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: Target player exiles a card from his or her graveyard.
to your mana pool. If you played a land this turn, Add 
to your mana pool instead.
