Weirded Vampire

The discount is the entire transaction here: nobody voluntarily plays a plain 3/3 at four mana, but the same body arriving off a discard you were going to make anyway is a completely different proposition. Madness inverts the usual math of card disadvantage, turning the act of pitching a card into a tempo swing rather than a loss. That alignment is why a vanilla-with-madness creature exists at all: the mechanic asks a deck to be built around discard outlets (looting effects, cycling, hand-size payoffs), and once that engine is running, this kind of creature stops being a topdeck and becomes a release valve for surplus cards. The stat line is deliberately unremarkable, because the design isn't paying for combat relevance; it's paying for the option to convert a dead card in hand into board presence at a reduced cost, at instant speed if the outlet allows. The exile clause buried in the madness reminder text matters more than it looks: the card leaves your hand for exile when discarded, and the cast-it-or-bin-it window opens immediately, which is what lets madness slip a creature onto the battlefield outside the normal sorcery-speed restriction. Filler on its own, this is really a measure of how much value a discard-matters deck can wring from the cards it never wanted to keep.