Okay, I converted all your cards into
EU format (take a look), and added the RoadWarrior's ideas as well. I still need a good card for these ideas:
"Wounded" some hero gets hurt somehow, roll 1 combat die or something. 1D4 to choose a hero at random?
"Trap" when do you set off such a trap? And who gets affected? How many dice?
"Creeping Darkness" nice art with a hero with a torch being followed by monstrous shadows. I was thinking something along the lines of clearing a room in one turn, or a monsters pops up?
"Rust" one Hero's weapon gets damaged by rust and he loses 1 combat die in attacks, until he gets to a town inbetween quests to repair it for 25g
"Lost Loot" or something similar, where you find 10 gold, lost by some monster.
"Pickpocket" one of the heroes loses 50g by a thieving goblin
"Rats!", "Bats!" and "Spiders!" place a swarm of rats/bats/spiders. Similar to a wandering monster with its own stats on the card. After attacking, they scurry away.
Just some ideas. Thoughts?