I'll add a name and an image later (if anyone has any suggestions?):
TBD
$6 - Treasure
$0
Gain two Silvers to your hand.
Secret History:
In a recent contest, I had a Treasure-Jewelry mechanic that allowed you to play them after you made buys in the buy phase. One of these cards was a treasure that produced $2 and conditionally (based on buys that turn) gained a silver to hand, i.e. a Treasure that produces $4.
Similar (and more importantly simpler) alternatives are possible as straight Treasures; in this case, this also meant dropping the conditional. However "+$2, gain a silver to your hand" seems too strong for a $6.
In order to balance I went to gaining two (weakened) silvers, "+$2, you may gain two silvers; while this is in play, silvers produce $1 less this turn."
And that got simplified to this - ultimately, it's stronger when playing multiples, of course, but significantly simpler.