Resonating Lute

Two rituals stapled to your entire manabase, restricted to the half of the game where doubling your mana actually breaks something open. This is a spell-slinger's engine dressed as a mana rock: every land you control gains the ability to tap for two of a single color, but only to cast instants and sorceries, so the ramp bends toward exactly the payoff a red-blue deck wants and toward nothing else. That restriction is the whole balance of the card; you cannot dump the surplus into a creature or an artifact activation, only into the burn, the counters, the draw spells, the storm count. The card-draw clause serves as the release valve: once you have flooded your hand casting nothing (or drawn into a pile of dead lands), it converts the excess into cards, but only while you are already holding seven or more, so it rewards the hoarding, tap-out-for-value posture a spell-heavy control deck naturally drifts into. The two halves point at the same player from opposite directions: the mana doubler wants everything spent on the stack, the draw clause wants a full grip. A deck built to satisfy both generates far more mana than it can spend on any single turn and turns the overflow into velocity, which is about as close as a four-mana artifact comes to being a dedicated spells-matter payoff while contributing nothing to the board on its own.