Treating The Chief Warg as the deck's best card because it is the gold (black and green) uncommon . In the data it wins 54.2% here, well below the deck's own average. Take Nasty Little Rabbit, Desolation Prowler, Mirkwood Pathmaker and before it.
Pumping Desolation Prowler too late. checks before or as you attack, so pay the 2 life in your main phase if you want the ferocious bonus. Pay after blockers only when winning that one fight is all you want.
Leaving one big creature alone against a black opponent. Crude Bent Blade and other ' a creature' effects let you choose what to sacrifice, so keep a cheap creature or Wolf next to your best one.
Too few creatures. Ferocious needs both a 4-power creature and creatures to reward. Aim for 15 or more creatures and count your 4-power sources (such as Pathmaker, Prowler, Ordinary Bear, Large Bear, Head of the Hunt, Mirkwood Nurturer and Gollum, Silent Slinker).
Taking flashy green rares that lose. Radagast of Rhosgobel and Gigantic Big Bear are usually taken around pick 3, but they win only 54.2% and 52.2% in this deck, and 52.6% and 51.5% across all decks.
Casting a second Gollum, Silent Slinker while the first is on the battlefield. It is , so you keep only one. Cast the second copy's Meager Meal side instead and keep the creature waiting in .
Cardsplain