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Diving into the comments, there are a number of reasons why that is

The slightly-rotten flesh and blank expression really does make this artwork explain the flavour text -- of these zombies wearing the dead faces of your allies -- quite well

One player may think theyre safe to go for their game-winning spell, but they really arent

Additionally, the new Magic novel, Omens of Chaos, features Angrath's daughter Jamira

And this card is only average if you can put a Pokemon to sleep before you play Toxicroak G, so not only would you have to get lucky to have the Pokemon stay asleep but you would have to have a Pokemon that retreated for free in order to not waste anything by putting Toxicroak G into the active Pokemon spot