Bracket 4: Optimized where you can expect to see explosive starts, strong tutors, cheap combos that end games, mass land destruction, or one players deck be full of cards off the Game Changer List Bracket 5: cEDH all bets are off, this is the highest power Magic, with the intention of playing to an established meta
BIG cards from Collector Boosters could have a special Booster Fun treatment: the vault frame treatment
Every Ooblet can learn its own unique dance moves, managed via a card system, and team up into a crew to really tear things up
You ideally want to pair it with flying threats so that it doesn't lock down your stuff as well
And playing an extra land or even two helps you mulligan even less often
8 - Burning Energy Inside the X/Y set, there were many special energies focused on the archetypes from that set, with the classic types: grass, fire, water, electric, fighting, psychic