Greasefang is one of the better build-arounds in Pioneer, and fits nicely into many different shells. The most popular (and best) is Abzan, where you get to play a midrange-combo deck that is capable of winning fast games or grindy ones alike. I had the misfortune to lose to this in the last round of the Pro Tour, and was impressed at how well it managed to turn the tables on disruption with a never-ending stream of hardcast Esika’s Chariots.
For reference, Reid wrote a Deep Dive on the deck last September, and it’s got plenty of great info as well:
Greasefang Combo in Pioneer/Explorer - MTG Deep Dive
Greasefang has gotten a ton of variations in Explorer and Pioneer, and a recent reprint in Dominaria United has helped it switch gears!
Let’s take a look at the greasiest fang in the format, Abzan Greasefang!