Most of our red-flagging (a way we denote that a card needs to move up in rarity unless the lead makes the conscious choice to keep it) has to do with board complexity

$24.99 Ultima, Origin of Oblivion (0421 - Extended Art) Final Fantasy Variants $17.99 Tidus, Blitzball Star (0512 - Extended Art) Final Fantasy Variants $22.99 Quina, Qu Gourmet (0471 - Extended Art) Final Fantasy Variants $10.99 Adelbert Steiner (0422 - Extended Art) Final Fantasy Variants $32.99 Ultimecia, Temporal Threat (0441 - Extended Art) Final Fantasy Variants $15.99 Seymour Flux (0452 - Extended Art) Final Fantasy Variants $29.99 Freya Crescent (0460 - Extended Art) Final Fantasy Variants $19.99 Shantotto, Tactician Magician (0507 - Extended Art) Final Fantasy Variants $54.99 Aerith Gainsborough (0423 - Extended Art) Final Fantasy Variants $13.99 Squall, SeeD Mercenary (0509 - Extended Art) Final Fantasy Variants $15.99 Ultros, Obnoxious Octopus (0442 - Extended Art) Final Fantasy Variants $15.99 Edgar, King of Figaro (0436 - Extended Art) Final Fantasy Variants 0 results found

Remember, class enchantments stack, so you can play multiple copies and trigger their abilities simultaneously, but each card needs to be leveled up separately
Eventually it will come up
I recommend: Sol Ring, Mana Crypt, Mana Vault, Grim Monolith, Ruby Medallion, and that new card Jeweled Lotus