Electro's Bolt

Four damage to a creature at sorcery speed is a serviceable rate, but the Mayhem clause is where the card justifies its slot: discard it this turn (to a rummage, a looting effect, any deck built to feed its own graveyard) and you can cast it from there for one less mana. The trick is that discarding is not casting: the card was pitched from hand, so the graveyard cast is the first and only time it goes on the stack. This reframes discard from a cost into a discount. Instead of holding a three-mana removal spell, you throw it away to something you were going to activate anyway, then buy it back cheaper. Mayhem does the structural work flashback does for other graveyard spells, but the tax sits on the front end rather than the back: no exile clause to pay later, just the requirement that you dumped the card this turn. And it stays honest about timing. Mayhem preserves sorcery-speed restrictions, so the second window opens only during your own main phases, only if you pitched the card that same turn; there is no graveyard instant to hold up on an opponent's turn. That ties the card to a specific rhythm of discard-then-recur rather than a general recursion engine. Outside a deck built to discard on purpose it is a slightly overcosted four-damage sorcery; inside one, it turns loot effects into cheaper removal.