Roilmage's Trick

Converge turns a one-sided debuff into a dial you set in the deckbuilding stage, and this is the cantripping version of that idea. The -X/-0 only ever touches power, never toughness, so it cannot kill anything the way a true removal spell would: what it buys is a combat math reset and a defensive blank for a turn. Spend a single color and you have shaved one point off the board, rarely worth four mana. Spend the full four and you blunt an entire alpha strike, then refill with a card. That scaling is the whole tension. The spell is priced for a manabase ambitious enough to produce four distinct colors but plays as near-dead weight in a two-color shell, which means its floor and ceiling sit further apart than almost any trick of its kind. The cantrip is what keeps the worst case from being a total wash: even at a small X you are at least cycling the card while buying a beat of time. Functionally it sits in the lineage of one-sided mass-shrink effects, with converge doing the work that a fixed numeric value would do elsewhere; the card asks how greedy your mana is and pays out accordingly. Built for a deck willing to stretch across colors, it is a defensive tempo tool that rewards manabase reach rather than raw efficiency.