I would really like to see custom monster cards! Even when they are just variations of existing cards... What about giving skoll card the "Immune to Stone Curse" effect? It would be haxx but, hey!, we're talking about a MVP Card here, Orc Hero gives Immunity to stun...
For Autumn Leaf cat you could give it a chance to loot Aloe Leaflets, Masterdrops Card could be a cousin of Mastering, giving +1 Dex and in combo with drops +10 hit.
Snow Bunny might loot these Egg thingies they are fed on (forgot the name).
Make Skoll pup equivalent to Iron Fist card. I see no reason why the formless race exp card should only be available by horrible luck on an OCA or DB...
Sapling: Gives the Skill Venom Dust lv 5
Aquaring: Chance to Autocast Cold Bolt
Just to throw some ideas... There is no need for a totally unique and fancy effect, Just make the cards more or less useful, even if it's just for fun...
