EDIT: Revised submission:Thanks to LastFootnote, gambit05, and emtzalex for their feedback.
Here's my submission for the week.
Scaffolding comes in a pile of 12 cards.
I've toyed around with a few versions, but it still feels a bit unrefined. The idea behind Scaffolding is a temporary card in your deck that will help you gain additional cards to accelerate and improve your deck.
If you play a Scaffolding and don't have any others in play, you could
trash return it to the Supply to gain two $2-cost cards, which might be nice if there are good $2-cost cards like Pixies in the Kingdom. If you already have a Scaffolding in play, you could play another Scaffolding and
trash return it to the Supply to gain two cards costing up to $4 (including more Scaffoldings). If you have two in play, you could play a third Scaffolding to
trash return it to the Supply and gain two cards costing up to $6. The duration-draw is primarily intended to help you find additional Scaffoldings in your deck, but could also provide some additional flexibility as the card might otherwise be a bit weak.