pokemon jigglypuff card (Pa-022) — Pokémon TCG Pocket Psychic Rarity Jigglypuff Card Fan Art Set

I think that both solutions were used, namely the first for the 1st Edition print run (which may have already been printed when the error was discovered) and the second for the Unlimited print run

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The cost reduction can even scale to accommodate Command Tax

Then, on top of that, you can pay 2 generic mana to Replicate it (a mechanic last seen in original Ravnica and related reprinted cards I believe) the spell, which creates a copy of it for every time the replicate cost was paid

Once you cast Sephara, she is able to further perpetuate a flying creature-based strategy by bestowing them with indestructible while also serving as a 7/7 with flying and lifelink whom you only paid one mana for