36 Uncommon cards
Any attacking creature can fight it in the hopes of slaying the wurm and getting a huge chunk of cards, but other players can sneak in with burn effects to piggy-back off the death trigger
You can take a mulligan and re-draw your first cards, but every time you do, your hand gets one card smaller, which encourages you not to bother unless youre seriously screwed over
Keep them sealed if your main goal is collecting sealed products, but remember that condition, set popularity, and scarcity matter
There have been plenty of alternate win condition cards in Magic: The Gathering before, but they usually take a lot of time and effort to pull out, outside of really cheesy combos
Command Beacon is a really nice utility land if your Commander costs five or more