While they werent playable and did not provide any benefits to players, you could display them as decoration
Spitting Dilophosaurus ( Jurassic World Collection) The Lost Caverns of Ixalan Market Price: $46.30 An incredible artwork that displays an important plot moment from the original Jurassic Park film, this 3/2 black Dinosaur plays beautifully in -1/-1 shells, and this card saw a notable spike in price during the spoiler season for Lorwyn Eclipsed when it became apparent that that sets blight mechanic would pair perfectly with this colorful, frilled, deadly Dino
Blue is a color that can benefit from "self-mill", dumping your own deck into the graveyard to gain rewards
They built their Grand Arbiter Augustin IV and The Gitrog Monster decks well and deserve to play them
This one can make treasures, but the coin flip is pretty bad
The various Merlin cards offer advantages when they are played and when they leave play