Removing your opponent's biggest threat and then reanimating it onto your side of the board grants you a huge advantage
Second, it turns something scary into a 3/3 Elk for as long as it stays attached
It's been the primary strategy of countless tier-one decks throughout the history of this game, such as Buzzwole-GX / Lycanroc-GX, Darkrai-EX variants, Tornadus-EX variants, the original Haymaker, and so many more
If there is ever a Location-heavy deck that is looking to flood the board with Locations and wants to keep them around longer, Felix could find a home there
Standard set releases generally arent as flashy as specialty products or Masters sets, especially once you are dealing with sets prior to Kaladesh , but Khans of Tarkir allows us to zoom out a bit from more recent releases and practically demonstrate the virtue of waiting 5+ years for a payoff
Tundra Wall is no joke for competitive players, either, granting a solid protection to Pokemon with Basic water energy attached, while Freezing Chill shuts off your opponents Pokemon from attacking altogether.
