Serum Powder [Darksteel] Arena League 2000 but a lack of them

but a lack of them will cost you even more

Set: Duel Decks Anthology Type: Creature — Human Minion Rarity: Common Cost: {2}{B} Discard a card

Set: Photon Shockwave Card type: Xyz/Effect Monster Rarity: Secret Rare Attack: 2300 Defense: 1700 2 Level 4 Dinosaur-Type monsters When an Effect Monster's effect activates: You can detach 1 Xyz Material from this card

Set: Eighth Edition Type: Land — Urza's Power-Plant Rarity: Uncommon {T}: Add {C}

Serum Powder [Darksteel] Arena League 2000 but a lack of themSet: Darksteel Type: Artifact Rarity: 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.)