From Llanowar Elves to Scuttlemutt you have tons of dorks that can tap for a mana, and you have some that tap for more than one like Palladium Myr
Upgrading the deck isnt a simple task either, since Amber Ruby hasnt been a strong meta choice in a while and the starter lacks many of the cards needed for it to compete
I won't pretend to know much about Final Fantasy
It's important to keep cards that will help you add gas to your tank, so try to hold onto cards like Lucky, Pongo, Tinker Bell, Strike a Good Match, Hypnotize, and Improvize when you see them
You make a creature that can make Treasures, you draw cards, and then you finally get a creature that can copy another creature for a turn
7 Mutilate The More Swamps, The Better Mutilate is another board wipe that doesn't just destroy creatures but gives them -X/-X counters