Here is an idea my brother came up with. There's actually a lot of potential with this mechanism.
<Card Name>
Action - Attack - $??
Perform the following three tasks in any order:
Draw until you have 5 cards in hand, each other player draws a card;
Discard any number of cards, +1 coin per card discarded, each other player discards down to 3 cards in hand;
Trash a card from your hand, gaining a card costing exactly $2 more than the trashed card. Each other player may trash a card from their hand, gaining a card costing exactly $1 more than the trashed card.
It's quite wordy, but it's a cool mechanism. Any thoughts on price, or other similar card ideas?