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
One player may think theyre safe to go for their game-winning spell, but they really arent
A 5/5 flier for 5 mana is quite the Baneslayer Angel, and you cant target it or make their owner sacrifice it, the anti-Liliana of the Veil clause
Diving into the comments, there are a number of reasons why that is
As if that wasn't enough, it even throws in a little Landfall bonus - mill a card whenever a land enters under your control
Additionally, the new Magic novel, Omens of Chaos, features Angrath's daughter Jamira