Release the cards necessary to summon them Sorry for the negative review.
Once per turn, a player can have Relinquished take on the Attack and Defense stats of an opponent's monster
C Common Cloudian Squall X SPELL Continuous Once per turn, during your Standby Phase: Place 1 Fog Counter on each face-up monster on the field
6 Sangan & Witch Of The Black Forest For a very long time, both of these cards flip flopped on and off of the Forbidden and Limited list, in particular around the time that Chaos Emperor Dragon Envoy of the End was seeing major play alongside the likes of Yata Garasu
As for battle protection, Threatening Roar and Waboku work well in a Number 88 deck, since they can be activated (and removed from the field) even if your opponent decides to skip their Battle Phase
Even if some stores stepped in to decree their own rules if players objected, it was far from a standardised affair like we see today