The drawback to using an EX Pokmon is that if it gets knocked out, your opponent takes two Prize Cards instead of one
But for only 1 mana, that card is going to be the best, highest quality card your deck has to offer, possibly netting you a lot of card advantage through a board wipe, stopping someone else from doing the same to you with a counterspell, or setting you up to complete an infinite combo
Storm Surge Theme Deck: Your opponents will want to run for cover when you play the Storm Surge theme deck
...Too soon
If that creature was a God, its controller reveals his or her hand and exiles all cards from it with the same name as that creature
Still, its one of the better and more flexible 4-drops you can play in decks filled with noncreature spells, and you can use it to manipulate combat in your favor and gain some life