Rest in Peace, Containment Priest, Relic of Progenitus, Nihil Spellbomb, and their ilk will shut you down hard, so keeping at least 1 piece of spot removal for these on hand should be a priority
All you need is a deck (either a deck you use all the time or a sealed deck), the rules below, and a slightly different way of approaching the game
Earth maps can come from other games in the FINAL FANTASY series
Magic: The Gathering FINAL 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
I'm not sure, but I'd bet this was the first scry card designed that played off the converted mana cost of the top card of the library
With mentor, theres the requirement to declare attackers as well as the power requirement