Old content should have the trial cards moved to an NPC in the next expansion. Or at a bare minimum, make it so you can trade in tokens (10, 20 whatever) to get the card, when applicable.

SE should also consider changing 24-man cards to be only Needed by players that don't already have the card. The rest can Greed for the MGP. I can't obtain two of the same mount whistles. Even though the whistle itself isn't in my inventory, the game knows (that little checkbox on the item) that I already have it. Make it the same with cards. Leave Greed in since the card isn't unique.

I'm helping my wife finish her TT mount. She has 120ish Memoria Miseria tokens and no drop. Eden's Promise... she's somewhere north of 75 kills by now. It is absurd.