Melek, Reforged Researcher

The cost reduction is the load-bearing half, and it is written to prevent the obvious abuse: only the first instant or sorcery each turn drops by , so this rewards casting one large spell rather than chaining many cheap ones. That constraint pushes the deckbuilder toward expensive payoffs (a fat draw spell, a big X burn, a heavy counterspell held up on the crack-back) rather than a storm-style ripple of one-mana cantrips. The body is the second reward loop: a graveyard of two dozen instants and sorceries makes it a genuine finisher, and unlike most spell-count payoffs it counts the cards already spent, so the P/T grows as a natural byproduct of doing what the reduction wants you to do anyway. The two abilities are pointed at the same play pattern from opposite directions: cast spells, fill the yard, then either close with the reduction fueling one enormous turn or swing with a Weird that has quietly become lethal. There have been prior spell-graveyard commanders that reward the same instant-and-sorcery density, but most of them draw cards or copy spells; pricing down the marquee spell of a turn is a different lever, one that turns a control shell's habitual end-step play into a tempo swing. The catch is symmetry with the earlier Melek printing's fragility: the toughness lives entirely in the graveyard, so a well-timed graveyard hate piece resets the creature to a 0/0 in the same breath it turns off half the deck.