
{T}: Add {C}.
Any time you could mulligan and this card 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.)
Serum Powder has 3 printings, first in Darksteel (2004). EDHREC ranks it #16,309 among Commander cards. It appears most in Stockman, Mad Fly-entist decks (2 on EDHREC). It has 2 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.