For the Unknown Event cards, your best bet is probably to proxy any that have previously existed, though you might occasionally find a few on the secondary market
Of course, youll need to have some sort of plan though just waiting for your opponent to get through their deck works nicely enough
This is an interesting one
In this deck, Elspeth is valuable, as she's another repeatable source of token generation like Forge
A few of Final Fantasy s saga creatures take a page from Kamigawa: Neon Dinasty: Theyre transforming double-faced cards with a creature on one side, and a creature saga on the other
So if you happen to get a Charizard first edition 13 years ago, and thought it was rare then, you wont believe what its worth now