Pokmon, the immensely popular media franchise out of Japan, was taking the world by storm
Also of note: up to this point, most Auras entering the battlefield didnt have an enters the battlefield effect unless it was directly tied to what the card was doing (Sleeping Potion taps the creature when it enters in order to keep it tapped) or just a normal cantrip, which many spells in the game were doing
And if we want to go one step further, the avenue in which we bring the hobby close to the art world, through grading, is ran by companies who also dont consider it card altering
It comes down to elastic recovery
That means you can run every single SpongeBob card in a single Commander deck
For some, that's going to disqualify it from contention, but we've seen stall decks in the past that don't mind sitting back behind a Druddigon and letting your opponent's Pokmon tire themselves out while they build up