Dragonlord Kolaghan

Across the five Elder Dragons in this cycle, each triggered clause taxes a different opponent habit, and this one reads as the most aspirational and the most often inert: ten life off the top whenever an opponent casts a creature or planeswalker sharing a name with a card already in their own graveyard. The condition is narrow on purpose. The duplicate has to be in the yard at the moment of the cast, so a lone copy going to the stack matches nothing; this punishes redundancy, the grind through a second or third copy of a threat, not recursion in general. It watches the cast regardless of zone (a flashback creature, a spell cast from exile), so long as a same-named card sits in the graveyard when the spell hits the stack. Reanimation through Reanimate and its kin never trips it, because those effects put the creature onto the battlefield rather than cast a spell. The load-bearing half is the haste anthem. A 6/5 flier with haste is a clean closer on its own, and granting haste to the rest of the board means every creature you deploy attacks the turn it lands: no summoning-sickness tax on the go-wide plan, no waiting a turn to convert a fresh threat into pressure. That static effect is what earns the slot, with the life-loss clause as swingy upside that can bury a duplicate-heavy opponent in a single mistimed cast and do nothing whatsoever against everyone else.