milotic ex pokemon card 42/191 Double Rare | Surging whitening and bends Milotic ex | EX Emerald

heres how they did it

Ability: Sea Swell As long as this Pokmon is in the Active Spot, your opponent cant play any Stadium cards from their hand

But this only works for cards found in main sets and to a lesser extent special sets since they're usually kept in production for a while (and if what TPCi said in the past is true, will continue to be printed as long as there's demand for 'em and they're not rotated out), this rule doesn't work for promos since they're usually only given away during a certain window of time and given a limited print run that's long enough to fit the predicted demand

It resolves even if that spell is countered or otherwise leaves the stack