I'm basing this game around Cardfight Vanguard
For those of you who don't know what that is, it's a card game.... go look it up

So for the cards:
Grade 0: SMJHL Player+ Goalie equivalent
Grade 1: SHL 3rd Linemen + Goalie equivalent
Grade 2: SHL 2nd Linemen+ Goalie equivalent
Grade 3: SHL 1st Linemen + Goalie equivalent
Grade 4: SHL Legend + Goalie Equivalent

Like in vanguard the purpose of the game will be to get the other player to 6 damage or in this case, score 6 goals. The front row will be your forwards (with your vanguard being your center) while your backrow will consist of 2 defensemen and your goalie. The game will be pretty much like vanguard with skills, counterblast, soulblast, limit breaks, break rides, etc. However to add a bit of a twist you can't use cards in your hand to guard and a situation card will be drawn every attack phase which will say something like "2 forwards vs 2 forwards" Where you have to pit 2 of your forwards vs 2 of their forwards. The objective is to have a higher attack power than what you are going up against. The defensive side will have the added benefit of their goalies atk power being added to their combined attack while as offense can obviously use skills and have drive checks.