Ultimecia, Time Sorceress // Ultimecia, Omnipotent

An extra turn is the payoff, but the graveyard is the meter that pays for it. Every surveil trigger, on entry and on each attack, lets you tuck fuel into the yard while keeping what you want on top, so the 4/5 body is a self-fueling accumulator counting toward a single threshold at your discretion: eight cards exiled plus spent on your end step. Because that transform clause is an end-step trigger, the flip can land the same turn you commit if you have already banked both the graveyard and the mana, but assembling them usually means keeping the creature alive across a full turn cycle first. What keeps the payment honest is that it competes with itself: the surveil that stocks the graveyard is also the material you might want to hold in the yard rather than exile, so the eight-card cost is a real subtraction from your resources rather than a formality, and the mana is no side expense either, demanding a committed Dimir base to fund. When Ultimecia transforms in place she does not re-enter; the same permanent picks up menace, and the extra turn Time Compression grants arrives with an evasive threat already on the board to cash the tempo. Most extra-turn spells have paid five to seven mana up front for the privilege; this one instead makes you earn every card of the fuel and then live long enough to spend it.