Selesnya Keyrune

This is the Selesnya entry in a ten-guild cycle of mana rocks that double as backup beaters, and it inherits the same structural logic across all of them: a colorless three-cost rock that taps for either of the guild's two colors, with a guild-colored activation to turn itself into a 3/3 for a turn. The pitch is the same throughout the cycle, but the value of the second mode depends entirely on the deck around it. In a two-color shell built on flooding the board and going wide, a rock that can swing for three in a stalled state or close out a game when you've run dry on threats earns its slot differently than a pure accelerant. The Wolf body is firmly in Selesnya's flavor lane, and the activation cost being one of each color rather than colorless is the quiet tax that keeps it honest: you cannot animate it off a single off-color source, so the creature mode rewards committing to the guild rather than splashing the rock for fixing alone. As a piece of design it sits in the long line of mana artifacts that try to stop being dead late, the same problem manlands and Mishra's Factory answer in the land slot. The Keyrune's answer is cheaper to deploy and more fragile to remove, since destroying the artifact costs you the ramp too.