While most cards have a rarity symbol on the bottom right, cards manufactured during a very brief initial period have no rarity symbol at all
Some sort of at least basic looting effect would have been good, but without it you need some other way to discard cards to then get the buff, and Howler has no way to take advantage of the buff themselves (no evasion), so maybe you want to target something else
Stay stealthy, study your scrolls, and thank you for reading
Maybe there's another Blazing Shoalbased deck or combo that could be scary, although it seems like it would have the same problem as Shoal Infect (needing to play a bunch of expensive, uncastable cards to make Blazing Shoal work)
It's useless in the wrong deck, but if you can manipulate your top card, it's a super efficient means of drawing cards