Romana II

A companion built to double whatever you already made, provided you made it this turn. That "entered this turn" window is what disciplines the whole ability: it cannot rummage through last turn's leftovers or copy a permanent token that has sat on the battlefield since your opening plays, so it rewards a deck that manufactures fresh tokens in a steady stream rather than one that banks them. Point it at a Treasure and you have a mana engine; point it at a creature token with a useful enters-the-battlefield trigger and you have a value loop; point it at something bigger and you double a threat, always tapped, always one activation at a time. The metering matters as much as the copying: one mana and a tap per turn cycle keeps it from spiraling on its own, so it amplifies a board you are already building rather than running as an independent motor. The vigilance is quietly relevant, letting the body attack without surrendering the tap for the ability on the crack-back. And the companion keyword frames the intent: this is a support piece designed to ride in the command zone alongside a partner, contributing a repeatable token-doubling effect to whatever plan the pairing sets up, never headlining it.