I've been working on making my own board game for the last 7 years (Not a deckbuilder.) I've decided to take a break and make some Dominion cards this week. Here's what I've got. Let me know of any mistakes.
Rook
(Probably been done before, but this is my own spin on it.)
Toymaker
(Maybe too powerful for $4.)
Tinker
Pulpit(v5)

Might as well just make a pure reaction card with no action part.
Old Versions:
Tinker
(Kind of boring?)
Pulpit
(Too similar to Altar?)