There are certainly cards that work fine with both and it can be done but you will either have stuff that does nothing with one half of your engines or you will have a pretty underwhelming Sneak Attack compared to what it can do
The regular version of this will probably stay at $1-$2, but the foil could be worth $10-$20 long term
Dinosaurs tend to have high defense across the board once you start getting to higher casting costs, effectively allowing you to double the forces entering your field
This card, Raging Bolt ex number 196/162, is an Ultra Rare with a colorful full-card illustration by aky CG Works
As for towns themselves, Final Fantasy includes 23 in total: 10 dual land towns, which work as entry-level Limited fixing
The rest severely lets Unfinity down, though, and feels less the retrofuturistic style it was aiming for, and more like mid-2000s flash animations, or, worse, soulless corporate art