You know, these are still good ideas for this game, especially with the number of ways you can get cards from Greg (Rogue Class is legacy, but for now we still have Savior and Jeleva) for the card ownership idea.
Along with supports showing their cost while on the board, I'm kinda wondering if something to show if one is from a copied support could be useful. Maybe not too many cases where that would be useful, unless it was something that can't be reinforced (such as the Jace, Mirror Mage VG or the Ob Nixilis one) but a use somewhere is still a use. Support cost though might be good for when using the Filigree Sylex, so you can check what that would hit with it's destroy/de-reinforcement trigger.