Riptide Island

This is a Planechase card built around a single creature type, and the design leans entirely on Sliver arithmetic. Planar cards usually hand out generic effects: card draw, chaos-triggered damage, a global tax. Here the whole card is a Sliver engine bolted to a plane. The steady drip of two tokens per upkeep does the accumulation, and the chaos trigger converts that count into a scaling anthem, with the pump keyed to how many Slivers you already control. That squaring effect is the point: chaos on an empty board is a shrug, chaos on a wide board with a dozen tokens is a lethal alpha strike that also grants haste, so the just-created tokens can attack the same turn. The token type matters as much as the numbers. Colorless 1/1 Slivers are functionally payloads for any Sliver deck's existing lords, which is where the plane stops being a generic subgame and starts being a build-around: it feeds the exact creatures a Sliver commander already wants to buff. The design is a rare case of a Planechase card that rewards a specific deck rather than sitting neutral on the plane stack, which is both its charm and its ceiling. Away from a Sliver shell it is two vanilla tokens a turn and an anthem for those two; inside one, the chaos die becomes a kill switch.