These cards just arent included at a huge quantity, and this is the kind of card that can be so ubiquitous in Commander decks that as soon as the price drops a bit itll get snapped up
A lot of the Knights seem to have vigilance, meaning you can attack with them and still have them untapped to use this ability to start killing off creatures
Decks built around high-power creatures, like Selvala, Heart of the Wilds and Xenagos, God of Revels, can often fetch nearly every basic from their deck with this card
Even if you sell it online, you need to take shipping costs into account
To enhance your artifact strategies, Necron Dynasties has cards like Biotransference and Shard of the Void Dragon, capable of quickly setting up game-winning combos
Hexproof and preventing noncombat damage is almost irrelevant in Limited, so you're left with a purely defensive creature which is rarely good in Limited