Myr Reservoir

The doubled-down tribal payoff: a mana rock that only feeds its own kind, paired with a recursion engine that only buys back its own kind. The colorless mana it taps for is locked to Myr spells and Myr abilities, which means it does nothing in a deck that is not committed to the creature type. That restriction is the whole bargain. A generic rock that taps for two colorless would play in anything; this one trades flexibility for a second mode that compounds the commitment. The graveyard-return ability turns every Myr that dies into a delayed redraw, so a board wipe against a Myr army becomes an inconvenience rather than a reset. The cards that punish you for going wide on small artifact creatures are exactly the cards this neutralizes, recurring your lost dorks one at a time. It sits in a small family of artifacts that gate their output behind a single creature type rather than a color, a design that asks you to build narrow and rewards you for staying there. The tension it resolves is the classic problem of artifact-creature decks: the bodies are cheap and the mana is plentiful, but the deck stalls once the graveyard fills with dead Myr. This answers both halves at once, funneling its mana back into the type and clawing the type back out of the yard.