Blue can always draw a lot of cards, so it may not be the most exciting topic, but someone had to do it
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Most collectors end up combining a few of these depending on what the card is and what it means to them
At those cost, they can have powerful effects but still be fair, they can win the game if left unchecked but be vulnerable to spells and/or creatures, they can protect themselves from one but not the other, they can generate card advantage repeatedly, etc
The most valuable Shadowless card sold according to Price Charting was a PSA 10 Gem Mint card in 2021, which sold for an incredible half a million dollars
Canoptek Spyder and Cryptothrall are the most notable of the many artifact creature synergies printed in the deck