Copy an opposing dork that's really good, and smash first
The ability to use it at instant speed to find a combo creature, destroy a creature, or exile an artifact or enchantment is incredibly useful
Food Chain is the most common partner in crime for Prossh, generating infinite mana (for creature spells), tokens, and death triggers simultaneously from there its just a matter of choosing how you want to end the game
The Twelfth Doctor only grants Demonstrate to the first spell you cast outside of your hand, limiting the payoff and requiring you to jump through a hoop
While there are specific rules to the format, again, the Final Fantasy cards are designed to be played, and mixed-and-matched, with cards from elsewhere in the pool of legal Magic cards
This includes colorless cards, though colorless card draw, which often comes from artifacts, can be perilous