The Planar Chaos design team of Bill Rose, Mark Rosewater, Matt Place and myself were sitting in a room, and the first order of business was figuring out what "alternate reality" means to Magic
Were still going to cover them here (loosely ranked from worst to best) so you know the best playable options available, but given the opportunity, leaning on another color and/or mana rocks when possible will usually yield better results outside of specific strategies
For example, a player can't activate the transmute ability of Muddle the Mixture if Pithing Needle naming Muddle the Mixture is on the battlefield
Food didn't exist before Throne of Eldraine
The Jolly Balloon Man Splinter Twin combos are real and easy to pull off, and The Jolly Balloon Man is kind of this in the command zone
If you buy two, you and a friend can practice games together before you start attending events