Invasion of Vryn // Overloaded Mage-Ring

Two lives on the stack, split by a combat step: the front pays for itself with a dig that keeps cards moving while you decide whether to commit to turning the corner, and the flip side arrives for free once you defeat the Siege. That structure matters because the back half is not a spell you hardcast. Defeating the battle exiles it and casts the artifact at no additional mana, so you spend only the combat resources you were already committing. And the prize on the other side is one of the more open-ended effects in the game: copying a spell you control, parked on a colorless artifact rather than behind a color's toll. The tap-and-sacrifice framing lets the copier wait on the battlefield until you have a target worth doubling, whether that is a finisher, a value spell, or another copy effect, and the copy can pick new targets. The whole thing is delayed gratification routed through the battle chassis. You pay four up front for selection, spend combat on your own terms to flip it, and only then does the permanent become a one-shot spell-copier. It rewards a deck already built to attack and already casting spells worth copying, folding card selection and a combo-adjacent payoff into a single flippable permanent.