I'm going to go with SHL Munchkin. For those of you that may not know what this is I'm not gonna bother explaining it as I'm lazy. Google it. But Munchkin already has a ton of themed games so going with SHL won't break the core gameplay. I'm not super creative when it comes to these but I can easily see some basic gear involved. There is already a concept of gear so we can just make some of those hockey typed (+2 Skates of <something witty>).

For class we can add some of the basic hockey roles. Maybe a goon card that can -5 from some opponents but makes you slow so run away isn't an option. Or a sniper option that allows you to draw an additional card.

As far as monsters go, you these will all be named after SHL HO. We all know that HO is the worst, so it's easy to plug them in. Eggy and SDCore can each be high level monsters while SMJHL HO can can be lower level cards.

If I was more witty I might actually try to build this as an expansion. But, alas, I am not.