Its a worthwhile investment in that sense
The Energy type designs available in this round of Deck Protector releases are: Water, Darkness, Dragon, Fire, Grass, Lightning, Metal, Psychic, Fighting, and a Colorless sleeve
Theyre a new kind of counter that help make some Phyrexian mechanisms stronger, and there are cards that help manipulate the number of them or where they are
Pairing it with something like Arahbo, the First Fang who gives +1/+1 to cats will make the tokens Cat Collector spawns a little more respectable
I know this may be an obvious point to some people, but I still see people using decks without Call Energy, and I feel they are just making themselves more reliant on luck than they need to be
Sorcery Color tag templates(None) Jacked Rabbit Ravenous (This creature enters with X +1/+1 counters on it