Smoke

A red symmetrical lock that shows just how willing the earliest sets were to print global rules-bending enchantments at a rate the modern game would never approach. The design is pure axis-warping: untap steps are the heartbeat of Magic's resource system, and capping them at one creature collapses every board that depends on multiple attackers, blockers, or tap-abilities. The cost is two red, with no activation, no upkeep, no maintenance: once it resolves, the constraint is simply true forever. Winter Orb and Static Orb would later explore the same design space on artifacts with upkeep clauses or symmetry-breaking outs; this card grants neither, leaving it both more brutal and more obviously a first-generation effect. The asymmetry is supposed to come from the deckbuilder's side: pair it with creatures that do not need to untap (walls, vigilance bodies, one-shot attackers) or with ways to untap your own team outside the untap step. That it lives in red rather than blue or white is the other artifact of the era; the color pie had not yet decided that permanent tap-state manipulation was a blue and white concern, and later printings quietly walked away from this effect rather than carry it forward.