Bonescythe Sliver (Duels of the Planeswalkers Promos) [Duels of the Planeswalkers Promos 2013] Zendikar Prerelease Promos its controller adds one mana

its controller adds one mana of any type that land produced

The sea gives

−7: Destroy up to two target creatures

instead deals that much arcane damage plus 1

Bonescythe Sliver (Duels of the Planeswalkers Promos) [Duels of the Planeswalkers Promos 2013] Zendikar Prerelease Promos its controller adds one manaSet: Duels of the Planeswalkers Promos 2013 Type: Creature Sliver Rarity: Rare Cost: {3}{W} Counter target spell. Create X Treasure tokens, where X is that spell's mana value. (They're artifacts with "{T}, Sacrifice this artifact: Add one mana of any color.") "Their appendages are sharper than our swords and quicker than our bows." Hastric, Thunian scout