The support cards so far either aid on using those effects, such as "Graydle Parasite" and "Graydle Impact", or help swarming "Graydle" monsters, such as "Graydle Split"
Unfortunately, the card was only paired with a few old cards to enable link material spam in several combo decks
They can also block attacking creatures, absorbing incoming damage
Here are links to some of those previews, along with an official video
Commanders like Feldon of the Third Path can make good use of it, for example, or it can pay for the vast majority of Herigast, Erupting Nullkites emerge cost
Here are the 10 most expensive secret rares in Paradox Rift