Its worth nothing here that all four of these cards will almost certainly end up being good long-term buys
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The one where its grey instead of black youve mentioned is a Grey stamp error
Drawing a card whenever you cast a spell with mana value 5 or greater is excellent with sweepers like pre-rotation Sunfall, where you can kill every creature and draw a card, with removal spells like Leyline Binding, or with the various Overlords that can enter the battlefield for cheap via impeding, like Overlord of the Hauntwoods
In addition, those copies are 4/4 Black Zombies with Vigilance meaning you have solid offensive and defensive capabilities
They are so odd I can't decide which one is worse: There's also the Whismur evolution line, only released in Japan, including Loudred and then Exploud , which are equally bizarre