Bloodmad Vampire

The 4/1 body is the whole gamble: enormous damage for the cost, gone to a single block, a ping, or a stray sweeper. Madness is what reframes that fragility into a feature. Discarding it (to a rummaging effect, a looter, an upkeep cost) lets you recast it for a cheaper price at instant speed, which means the Vampire can arrive mid-combat after blockers are declared, or ahead of an opponent's swing while their mana is tapped and no answer is up. The counter clause rewards exactly the connection this body is built to make: land one hit on an open board and it climbs to 5/2, then 6/3, the toughness creeping up just enough to survive the blockers the first swing dodged. That is the tension the design plays on. A 4/1 with no evasion will not connect through a developed defense, so the card asks you to time it for the window when nobody can profitably block, then turns that single connection into a snowball. Left to be cast for full price off the top of your deck it is a glass cannon; routed through the discard outlet it becomes a cheap, instant-speed threat that grows the moment it gets through. The aggressive red shell that wants disposable bodies and cheap pressure is the same shell that generates the discards to power madness, so the card and its enabler tend to want the same deck.