Obelisk of Urd is a rare Artifact card from Zendikar Rising Commander (ZNC), collector number 115. Current market price: $2.98, TCGplayer market prices via Scryfall.
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 this artifact enters, choose a creature type. Creatures you control of the chosen type get +2/+2.