Serum Powder [Darksteel] SPA Acolita de Karametra Nothing grows in Kjeldor but

Nothing grows in Kjeldor but seaweed

you may tap an untapped creature you control rather than pay this spell's mana cost

Set: Rivals of Ixalan Type: Creature — Siren Pirate Uncommon Cost: {3}{U} Raid — This spell costs {1} less to cast if you attacked with a creature this turn

Set: Mirrodin Type: Artifact Rarity: Rare Cost: {5} Whenever an opponent draws a card

Serum Powder [Darksteel] SPA Acolita de Karametra Nothing grows in Kjeldor butSet: Darksteel Type: Artifact Rare Cost: {3} {T}: Add {C}. Any time you could mulligan and Serum Powder is in your hand, you may exile all the cards from your hand, then draw that many cards. (You can do this in addition to taking mulligans.)