Lavinia, Foil to Conspiracy If you're playing Commander only on your turn, you're severely hampered
This problem only worsens when playing in person with an experienced player
Delirium At the beginning of each opponents upkeep, if there are four or more card types among cards in your graveyard, this creature deals 1 damage to that player
Part of me wonders if we're going to lean harder into card types going forward - something rivals like Magic: The Gathering already do
The only card that really comes close to this is Crux of Fate, but thats only good if Dragons are relevant
That's a very good advantage, and the fact that it's so cheap to play means you can do a massive amount of setup early in the game, or just a play a big monster and have it get over its summoning sickness before the opponent can do anything whatsoever