Prismabasher

Vivid is the mechanic that finally puts a number on something green has always wanted from its splashes: rainbow manabases have historically been a fixing tax, a cost you pay to cast your spells rather than a payoff for paying it. Here the color count is the payload. In a mono-green shell the trample body lands with a whimper, buffing a single creature by one; stretch to a genuine five-color board and the enters trigger reads for +5/+5 on each of up to five creatures, arriving in the same beat as a 6/6 that already wants to swing through blockers. That scaling defines how the card evaluates: it is deliberately floor-first, a fair midrange creature at its worst and a one-card overrun at its best, and the gap between the two is entirely a deckbuilding decision about how greedy your permanents' colors run. Note what the trigger measures: X counts the colors among permanents you control, not the colors in your identity or your hand, so it rewards what you have actually deployed to the table rather than what you could theoretically cast. The buff itself lands the turn Prismabasher enters, but the body cannot follow it into the red zone that same turn without outside haste, which reframes the ETB as a way to make a preexisting board suddenly lethal rather than a swing you complete alone. The trample stays on Prismabasher; the targets get raw stats, so the wide board still has to solve its own blockers.