Lands don't untap during their controllers' untap steps.
At the beginning of each player's upkeep, that player untaps a land they control.
Hokori is a mono-white Stax piece on a body: it forces everyone (including you) down to effectively one land per turn, choking the table's mana while you build mana advantages it doesn't affect. You deploy cheap mana rocks, untapped lands, and land-untap effects to keep ahead, then ride incremental advantage to a slow grind win or assemble a prison lock the opponents can't break out of.
Cripples greedy ramp, control, and combo decks that rely on holding up multiple mana
Cheap mana rocks and lands-that-untap-themselves let you sidestep your own symmetry
Mono-white access to cheap protection (Mother of Runes, etc.) and stax effects
Punishes the table immediately on a 4-mana body that can also chip in damage
Symmetrical effect also slows your own development if you don't build around it
Mono-white card disadvantage makes the long grind hard if the lock breaks
Dies to any removal, undoing the lock and forcing a recast at higher cost
Aggro and low-curve decks that have already deployed are far less affected
Needs to land early; off-curve it just annoys the table without locking anyone out
Thins and rebuys lands so you keep dropping a land each turn while opponents stall out.
Lean into mana sources that ignore the lock—Mana Vault, Mana Crypt, Sol Ring, Smothering Tithe, and Treasure makers—so your symmetry is one-sided. Add protection (Mother of Runes, Swords to Plowshares for problem creatures) and complementary stax like Winter Orb, Static Orb, and Stasis-adjacent pieces to deepen the lock. Top it with efficient closers (Stoneforge package, planeswalkers, or a token engine) so you actually convert the prison into a win instead of stalling.