Another two cards that I think are criminally underplayed in Commander are Energy Tap and Sacrifice because they are two of the most powerful rituals in the format in terms of how much they ramp (especially with an expensive Commander like Tiamat)
No matter how many creatures you have, you cant block
The designer originally made a mockup of a Pokmon-meets-Wingspan card last month, and debuted the full version of the game available for free on Tuesday
If One with the Multiverse leaves the battlefield and later returns to the battlefield (or you play a second one), it's considered a new object and you may cast a spell using its last ability regardless of whether or not you did so earlier this turn using the enchantment that was on the battlefield before
Be fun to play with, be a great loser, and congratulate everyone on what they do, because most players put a lot of time into their decks and it feels good to be told that something they did was awesome
People in the house were pretty well split up among the major archetypes, so I decided to start by trying a number of radical concepts