Obviously, that number was hyperbolic, but then I wondered after the fact if I could indeed come up with a list that large off the top of my head
Players must pay all costs and follow all normal timing rules for spells cast with Extraordinary Journey's first ability
You need to be able to support a colorless Land, and if getting to isn't likely, it won't work, but Westvale Abbey is solid in many decks as a mana sink, and Ormendahl is a problematic threat no matter the situation
What deck are you going to build next
Personally, I think that they could be played as altered in old school games as long as both players agree to it beforehand
But you know, this is one of the main ways to win a game of MTG anyway