Regarding the legality of the cards: Magic: The GatheringFINAL FANTASY (FIN) is a Standard-legal set Magic: The GatheringFINAL FANTASY Commander (FIC) and FINAL FANTASY Through the Ages (FCA) are Commander-, Legacy-, and Vintage-legal sets, and individual cards are also legal where already available in other formats Magic: The Gathering FINAL FANTASY Play Boosters contain cards from FIN and FCA
I look at cards with a mono-red color identity that either search your library or specifically find mountains from your library
Usually, card stock is initially printed with the back design on the correct, non-foil side
Consider your partner's colors and how nice it is to have card draw payoffs like Diviner's Wand, Horizon Chimera, and Dream Trawler
Dimir Tempo decklists will cost you closer to $5,000
A 3/3 with first strike already holds the ground well, but its true strength is that it copies the next spell you cast after it enters