At our in-person game jams we often have a few teams creating board and card games.

This is going to be a bit different for a fully remote jam - but I strongly recommend giving Tabletop Simulator a look. It allows you to create all your components, cards, boards, etc. and then have players drag them around in the physics simulator.

The downside is that all players will need to own Tabletop Simulator - though for play testing etc. there's definitely a few people already signed up to the jam who own it and could help out. If you're happy with the game you end up with - you can even release it on Steam workshop.

I've been told Tabletopia also allows you to create your own games in a similar way (potentially for free). I have no experience with it but it's worth checking out if you don't already have Tabletop Simulator.