Secret of Bloodbending

Mind control effects are old (Control Magic, Sower of Temptation, Mind Control itself), but this one steals something subtler than a creature: it hijacks an opponent's agency for a defined window and then removes itself from the game. The base mode hands you their next combat phase, a window where you make their decisions, declare their attackers, and can walk their own board into unfavorable trades before the effect wears off and the spell exiles. The waterbend clause changes the entire proposition: pay a punishing additional ten, and one combat phase becomes their whole next turn. A stolen turn is not a tempo swing; it is a chance to walk an opponent into their own combo, empty their hand into your removal, tap their lands, sacrifice their own permanents, or simply steer their game plan into a wall. The exile clause caps the whole thing at a single use: no recurring lock, no grinding an opponent out over many turns, just one heist to squeeze dry before it is gone. The design lives entirely in the fork between a cheap combat-phase steal and a backbreaking full-turn one, with the ten-mana toll standing between them as the price of total control.