Thanks to everyone for their submissions!
Painter
$9 Action
Choose one: +2 Cards; or gain a card costing up to $5.
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During a player's Buy phase, this costs $2 less per Action card they have in play.
Pretty good, actually! Needs an Asterisk in it's cost, but that's a minor nitpick. I do like 5-gainers. 8/10
weirdly enough, this was the last asterisk in this contest. Effect needs a little rewording to make it closer to WotChameleon. Works good as a Lost City type thing. 8/10
Mineshaft - $9
Project
When you play a Treasure, you first get +$1.
When you gain a Victory card, +1 Buy.
I like this quite a lot! 9/10
Idk if this is worth $10, but it's close enough. really cool effect! 9/10
Leprechaun Gold
$9 - Event
Gain a Gold and a card costing up to $5.
11$ worth of stuff for $9. Pretty good! 8/10
Gentrification
Project
$12
Set aside a non-Victory Action card from the supply next to this and place your project cube on it.
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When scoring +2VP per card you have from that pile.
Nice, a Obelisk you choose; Honestly the fact that this takes a card out of it's pile is what brings this down for me; well, unless in setting it aside you also gain it, giving you +2vp. At 12 this probably never gets picked up, sadly enough. 6/10
Pledge just doesn't seem worth it to me. why would I buy this instead of just gaining a Province? I do like the next time mechanic though. 6/10
Metropolis
Action - $10
+3 Actions
+3 Cards
+3 Buys
You may trash up to 3 cards from your hand.
I like this a lot! just a big Lost City with a lot of extra stuff! 10/10
I like night cards, but this just seems so close to perfect for it's cost. 9/10 needs just one little something to kick it up. Idk what.
Summon but it's actually good. 10/10
I actually thought stonecrafting was pretty good. Golden Ticket is really cool though. 10/10 honestly.
Thank you, everyone, for your submissions!
Winner: Gubump with Ceremony.
Runner-ups: Udzu with Wonka Bar/ Golden Ticket and NoMoreFun with Metropolis