Tideshaper Mystic

Mana fixing usually lives on the lands themselves, on artifacts, or on a one-shot sorcery; this puts the lever on a repeatable body that can rewrite a land's type every turn it untaps. The activation reads like color correction, but the more pointed use is denial: turn an opponent's nonbasic into a basic type and you strip away whatever its text was for, whether that is a utility land's activated ability or a dual's second color. The same tap can enable, feeding a land-type-matters payoff or a domain count your own manabase cannot reach on its own. The "only during your turn" clause keeps the disruption fair: it cannot ambush a fetch mid-resolution or undercut a tax during the opponent's upkeep, so every application has to be staged inside your own turn structure. What truly separates it from a Stone Rain on a stick is not the timing but the absence of permanence: the type reverts and the land survives, so this is a tempo tax that recurs rather than a piece of land destruction. The payoff for that recurrence is a single-mana wrench you can throw each turn against any deck that staked its mana or its land synergies on a fragile assumption, attached to a 1/1 frame that asks only to keep untapping.