Overpowering Attack

Extra combat spells have always priced their explosiveness in raw mana, because the payoff is a full second attack step: Aggravated Assault sits at four with a mana-rock rebuy, Seize the Day leans on flashback, Relentless Assault set the baseline back when doubling your attacks was a red mage's win condition. What the freerunning clause does here is restructure that price around a combat trigger rather than a mana engine. Cast at full cost, this is a slow, expensive Relentless Assault variant that also untaps every creature that attacked. But connect earlier in the turn with the right attacker and the effect drops to three mana, converting a single point of damage into a discounted second swing: attack, deal damage, then in your post-combat main phase freerun into an additional combat phase and an additional main phase. This is still a sorcery, so the whole sequence lives inside your own main-phase timing; the freerunning cost buys a price break, not a change in speed, and it grants exactly one extra combat per cast. The untap-all clause is what keeps that second combat from being empty, since a fresh attack step is worthless if your creatures are still tapped from the first. The mana value of five is a decoy: the design intends the card to be paid for with combat damage, not lands, which reframes it from a top-end payoff into a mid-turn continuation. It is a doubling spell that asks you to prove you already hit before it hands you the next swing.