Parade: Action, $2
+$2
Trash this and gain the cheapest action card costing more than this, if there is one. Put a Parade Sticker on that card.
When you play a card with a Parade Sticker, trash it and gain the cheapest action card costing more than it. Transfer the Parade Sticker to the gained card.
Stickers are a pretty cool online only idea. Could also do something like:
Sharehold: Action/Victory: $5
Reveal a card from your hand. Put a Sharehold Sticker on it then return it to your hand.
Worth 1 VP for every 3 cards in your deck with a Sharehold sticker (rounded down)
or
Investor. Action $4
Reveal an action card from your hand. Put an Investor Sticker on it then return it to your hand.
When you play an action card, +$1 per Investor sticker on it.
or
Jinx. Action/Attack $4
Each other player reveals the top card of their deck. If it is an action or treasure card, put a Jinx sticker on it. In either case, they return it to the top of their deck.
When a player plays a card with a Jinx sticker they may trash it. If they do not, they gain a curse.