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Is your foe about to steal your best creature

Clams and oysters are, admittedly, in the same taxonomic class of bivalves, but so are you, dear human reader, and a raccoon

Antiquities is a puzzling set to look at through the lens of 30 years of Magic, with its emphasis on artifacts over other permanents and the strange ways in which different colors interacted with that card type

If you can get all five mana colors, then this cards activated ability lets you run through the top of your deck to find the creatures you need

It could be a restriction on card names, artists, art elements, flavour, or any other number of things, but the point is that the deck is built around that quirk