Wandering Ent is one of the worst ent allies in game. Not because it is a bad card by itself, but because other ent allies can do anything he does better. Depending on what you want to use Wandering Ent for there are always better alternatives:
•If you want to defend : Use Derndingle Warrior warrior instead. At the same cost he has the same by default and can provide up to 5 when using his Action.
• If you want to attack : Use Skinbark or Quickbeam instead. Skinbark costs one ressource more but provides double the attack points of Wandering Ent which is worth in my opinion. Quickbeam obviously is strictly better at attacking than Wandering Ent because of his readying response.
• If you want to quest : Use Quickbeam or Wellinghall Preserver instead. Again, Wellinghall Presever is more expensive but also provides a lot more value with one more and the additional healing effects.
Unless you try to flood the table with as many ents as possible there are better options than Wandering Ent.