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Obelisk of Urd [Magic 2015]

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Set: Magic 2015
Type: Artifact
Rarity: Rare
Cost: {6}
Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
As Obelisk of Urd enters the battlefield, choose a creature type.
Creatures you control of the chosen type get +2/+2.