While I have nothing in general against the card, I think it would help to distinguish the two decks if colored artifacts were restricted to the Science deck.

This could easily be an enchantment and would be in a normal set.

This is a mirrored pair with Massey's Galvenizer.

The main differenc is that this sucks. It does nothing the turn you play it - whatever turn that is - until you actually have the seven mana to pray. By then you have spend nine mana for your first actual benefit from that card - replacing itself.

If there is one card, where the trigger condition should be changed from "pray" to "gain life", it is this card. In this way it not only has a chance at being useful before turn six, but also aesthetically mirrors its partner by generalizing the keyword specific trigger to something more general (tinker -> sacrifice, pray -> life gain).

I'm also close to arguing these two should be enchantments.