Senseless Rage
A +2/+2 Aura carries a built-in liability: you spend a card to buff a creature, and any answer to that creature erases both at once. Madness is the rider that reroutes how you deploy it. Notice that the alternative cost is not a discount (it matches what you would pay to enchant the creature normally); what it buys is a different moment to cast. Pitch it to a looting effect or a dedicated enabler, and the Aura resolves off an action already happening for its own reasons, folding a deployment that would otherwise cost a draw step and a main phase into a turn already in motion. The creature it lands on is usually one summoned the same way, off the same discard engine, so the Aura's fragility disappears into a sequence the deck was running anyway. No one plays this as a standalone beater; it is one moving part of a graveyard-and-madness shell where pitching cards is the plan, not a tax. The payoff for accepting the two-for-one exposure is a +2/+2 swing arriving at the tail of a discard, at instant speed if the enabler allows, precisely the tempo such a deck is engineered to produce. Strip away that shell and you have a plain pump Aura; drop it into one and the discard trigger earns its slot.
