Spore Cloud

Instant    (CMC:3)

Tap all blocking creatures. No creatures deal damage in combat this turn. Neither attacking nor blocking creatures untap as normal during their controllers' next untap phase.

FE • ENSusan Van Camp

™ & © 1993—1994 Wizards of the Coast

Legal in: Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Singleton 100,Commander

Oracle Text (click to copy):

Spore Cloud {1}{G}{G} Instant Tap all blocking creatures. Prevent all combat damage that would be dealt this turn. Each attacking creature and each blocking creature doesn't untap during its controller's next untap step.

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10/4/2004
Only makes attackers or blockers that have been declared before the spell is cast unable to untap as normal next turn. So, if used before attackers or blockers are declared, it is simply a Fog-like effect. If used after attackers are declared but before blockers are declared, it does the Fog effect and makes attackers not untap as normal. If done after blockers are declared, it has full effect.
10/1/2008
If a creature affected by Spore Cloud is untapped at the time its controller's next untap step begins, the "doesn't untap" effect doesn't do anything. It won't apply at some later time when that creature is tapped.
10/1/2008
Spore Cloud doesn't track the creatures' controllers. If an affected creature changes controllers before its old controller's next untap step, Spore Cloud will prevent it from being untapped during its new controller's next untap step.

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Card Spore Cloud is not on TCGPlayer.