Elvish Harbinger [Duel Decks: Elves vs. Goblins] Aether Revolt Prerelease Promos You may spend blue mana

You may spend blue mana as though it were mana of any color to pay the activation costs of Quicksilver Elemental's abilities

if you control twenty or more creatures

It suddenly dawned on Jorin that farming was quite a noble profession

Set: Invasion Type: Sorcery Rarity: Rare Cost: {1}{B} Separate all creatures target player controls into two piles

They look slow and sleepy—until they catch the scent of prey

Elvish Harbinger [Duel Decks: Elves vs. Goblins] Aether Revolt Prerelease Promos You may spend blue manaSet: Duel Decks: Elves vs. Goblins Type: Creature Elf Druid Rarity: Uncommon Cost: {2}{G} When Elvish Harbinger enters the battlefield, you may search your library for an Elf card, reveal it, then shuffle and put that card on top. {T}: Add one mana of any color.