Apex of Power

Cast it from hand and the spell pays you back: ten mana of one color, more than enough to chain into whatever the top seven cards turn up. That clause is the whole engine, and it is built as a deliberate trap. Ten mana of a single color points hard at red, but red is exactly the color least equipped to spend a windfall of fixed mana on the spells it just exiled, so the card quietly asks you to bring your own payoff: an X-spell, a costly bomb, a way to convert the burst before it empties. The exile-and-cast clause is a wash if you do nothing with the refund, which is the design's way of keeping a ten-mana sorcery from being a free win. Where it gets dangerous is the rebate's color flexibility: name blue, name green, name anything, and the spell stops being a red card and becomes a generic ritual that happens to dig seven deep. The seven-card exile is impulse draw without the upside of recursion (whatever you do not cast is gone), so the rate rewards a deck that can empty the window in one turn rather than bank it. It is a closer dressed as a draw spell: pay the cost honestly and the refund builds the combo turn itself.