mtg unicorn deck commander EDH Deck Lathiel, the Bounteous Dawn 100 Magic – Moonveil Games Good-Fortune Unicorn — Secret Lair

Appearing in all languages of Collector Boosters, this card is only available in Japanese

Since you cant store your deck in a sorcerers workshop, keep it protected between quests with this deck case

There are a few other options to consider

Remember your cube is a limited environment too, not just a giant collection of cards

Many are banned or restricted in one format or another, or at least have a history of such

Making sure you have a handle on it during the game is all you can do, but if it's a skill you'd like to work out and make stronger I'd suggest any of these commanders as excellent options to up your game.