Summon: Bahamut

Nine mana buys a clock that ticks whether you like the pace or not. The Saga frame is the whole design conceit here: a body that big normally arrives, blocks, and threatens for several turns, but this one is on a demolition timer, dismantling problem permanents on chapters I and II, refilling on III, and then detonating on IV before the whole thing sacrifices itself. That the first two chapters are removal signals what the card wants: it is built to be cast into a developed board, not an empty one, with two rounds of nonland-permanent destruction to clear the way, the Saga's own draw step keeping you from stalling on the road to the payoff, and a fourth chapter that converts the total mana value of your other permanents into face burn. That last clause is where the deckbuilding tension lives. Mega Flare counts the total mana value of your other permanents, so the more you have committed to the board, the harder it hits, and the incentive to overextend runs directly against the removal-heavy early chapters that assume the opponent is the one holding the board. The 9/9 flier is almost a consolation prize: for the three turns it exists before self-sacrifice it wants to be attacking or blocking, but the card's real win condition is arithmetic, not combat. It rewards a battlefield stuffed with expensive noncreature permanents far more than it rewards a beatdown plan.