(1) During your Standby Phase, if you do not have Light Barrier in your Field Zone: Toss a coin, and if the result is tails, this cards 2nd and 3rd effect are negated until your next Standby Phase
But on the other hand, the actual power boost offered by Terastallization is better reflected in the modern cards various capabilities, even as the Pokmon ex rule helps to balance them with the wider game
EDIT: Balanced Aerirnr by making the boost only half the ATK and SS during the end of the Battle Phase, made Heart Steal work for both players, and made Cerbr work for the turn after they're SSed.
Either way, the content creator has managed to break the record in a brutal way , leaving far behind any other Pokemon card sold previously
I dont really remember getting them or having them as a kid