Shadow of the Second Sun

The trick is entirely in the phrasing: an additional beginning phase after the postcombat main means the enchanted player untaps, upkeeps, and draws again, then goes straight to the end step. The reminder text is explicit that no second main phase, and no second combat, gets stitched in. So this is an extra-turn enchantment stripped of the two things extra turns are usually cast for. What remains is the untap step, and that step is the entire payoff. Every mana source refills, every tapped permanent stands back up, and any "untap-triggered" ability fires a second time, all inside a single turn. It is built for engines that convert untaps into resources rather than for combat tempo, which is why enchanting yourself reads less like haste and more like a mid-turn battery recharge folded into the turn structure. The word "player" rather than "creature" is the other design choice worth noting: this can be aimed at an opponent, and while gifting them an untap, an upkeep, and a draw is usually a favor, it can be weaponized in the narrow cases where an extra beginning phase hurts them (an unwanted upkeep trigger, a mandatory draw against a thin library). It is extra-turn design that refuses to hand you the attack step and asks you to build around the untap and the draw instead.