Easy two-for-one on card advantage and should be right at home in any squirrel deck, plus a very reasonable inclusion in other green decks
You could easily trade your one- and two-drop in Limited and then win the game with this massive card advantage and tempo swing on turn three
This gets around cards like Pithing Needle, and possibly even sacrifice effects (Judge?)
On the other hand, the Instants offer some great support by Bile Blight killing a board of tokens (this will obliterate Tyranid players), Dark Ritual helping to cast things earlier in the game, and Brainstorm helping you smooth out future turns
Each portfolio comes with a booster pack from the new Pokemon TCG: Mega Evolution expansion, so you can start filling it up right away
What makes this card special, however, is that this card can return to your hand instead of being discarded if its holder uses an attack that might otherwise get rid of it