Radiant Epicure

Converge is the string that pulls this drain wide: cast it with a single color and it is a five-mana 5/5 that swings two life, a rate nobody would bother building around. Fund the casting cost with mana from all five colors and the same trigger becomes a ten-point life swing on entry, the kind of number that ends a race outright. The card is really a wager on your manabase: it asks how much color-fixing you are willing to run, then pays out linearly against it. That linear payoff is the whole tension of the mechanic. Most life-drain effects in black are flat, priced once and printed at a fixed number; Radiant Epicure instead hands the reward to the deck's fixing rather than its black density, an unusual axis for a mono-black-coded effect to sit on. The body matters here too. A 5/5 is large enough that the drain is a bonus attached to a real threat rather than a spell stapled to a token, so even the floor is a creature worth resolving. Everything hinges on how many colors your mana can actually produce at the moment of casting, which turns a straightforward Vampire Wizard into a deckbuilding question about how greedy the manabase wants to be.