The reason why we go with Esior over the more poular Siani, Eye of the Storm is that Esior is a guaranteed turn 2 play that we can cast before casting Eligeth, providing an extra layer of protection for our most important card
Honorable Mention: Top Five Non-Ixalan Pirates [casthaven]Kari Zev, Skyship Raider[/casthaven]Summons a 2/1 red Monkey creature token
For this months deck, Im trying out a recent build with some new cards: Mono Green Landfall
To help offset that, the second ability is very powerful
That said, considering it has to be against a creature and not simply target, means you wont be getting the benefit from hitting players themselves, or opponents can simply choose not to block with one of their creatures and that means no counters, but with spells like Duel for Dominance or Ents Fury that forces Wolverine to attack an opponents creature or enchantments like Fire Whip can mitigate this restriction pretty easily
So few people and collectors remember or are aware of this early rare item, that you won't find it listed in any other price guide than the PokGym's