One of the best Special Energy cards to be printed in a while, Call Energy can fit into almost any deck. Its effect of being able to search your deck for 2 Basic Pokemon makes it a great card if you start with it, and is a very flexible option as opposed to running a dedicated "starter" Pokemon, such as Pachirisu. At worst, later in the game, it still provides 1 Colorless Energy, which most Pokemon can use anyways, so it's not a completely dead card later on.
Though this card can be splashed into virtually any deck, it combos best with Phione, letting you search out your basics and evolve at least 1 of them within 2 turns, all with minimal effort. Granted though, the odds of starting with or obtaining both cards within 2 turns is unlikely, but is still a great way to set-up regardless.
Modified - 10/10 (A great card for any deck that doesn't use/need a dedicated starter Pokemon)
Limited - 9/10 (Though its effect is somewhat less useful since you should be running plenty of Basic Pokemon, it still can be useful in searching out a specific Basic and it still provides Energy)
Unlimited - 2/10 (Can be used I guess, but you shouldn't need to)