Or rather, they can do so, but it's counterintuitive and is likely to turn your commander from a decent threat that's hard to deal with to a game-ending wrecking ball that can dish out 21 commander damage in a single turn
The good news is that protecting a card properly costs cents, not dollars, and it greatly reduces returns and buyer complaints, and possibly gives you negative feedback, ruining your eBay profile
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The most powerful card from Assassin's Creed is Yggdrasil, Rebirth Engine, which sees niche Modern and Legacy play, often as a one-of in Show and Tell decks in Legacy or as graveyard hate in Modern
Fleshy, with just a hint of leather
It also screws with combat slightly, having an activated ability that allows a creature to deals damage equal to their toughness rather than its power for just White OR Blue