Nice to see a SSB CCG in the works. It looks good and very true to the video game series. I just read the rules and looked over many of the cards and most of it looks good except for one concept...Flipping a coin.
[puts CCG designer hat on] The way I see it games should have a proper balance of chance/skill. Just by nature of card games when having a shuffled deck there already is an element of chance created, and to me seems to be the right amount of chance vs skill ratio (little chance, mostly skill). A CCG can modify this by having cards that allow you to look through your deck and retrieve cards, or even rules that allow this. This makes for less chance and more skill. Then the other extreme is when a card says "roll dice" or "flip a coin" to the outcome. This adds more chance to the game.
Personally I think the balance is fine if most cards leave these modifiers alone. But when a game uses one of these concepts too heavily then the chance/skill balance is thrown too far off IMO.
[back to SSB] While I haven't played SSB yet, and I probably will with a friend, it seems like it might be too unbalance in this regard. When I finally draw a great card I have been waiting turn after turn for, I want to be able to know I can use it the way it's text states, and if that card gets denied, it's because an opponent denied it and not a coin. IDK if the coin flipping is used to represent the defensive shield the video game has, but if so I would implement that and a more predictable method.