Nice combo but I think 'Mind over matter' is extremely akward to get out quickly with no mana acceleration and any cards that are discarded are lost, try 'High Tide' if you need some blue mana acceleration. If you wanted to beef up your creatures but keep this type of ability you could add 'Fatestitcher' in to get the same ability and have a creature that could block and be unearthed. Even just adding him to your deck and discarding him with 'Mind over matter' and unearthing him afterwards.
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You'd be surprised how effective only two in a deck can be and with the ability to re-use them from the graveyard with Quest for Ancient secrets, 2 is usually alright, I'll try running it with 3 and see how it plays, I think it could definitely be tweeked a little more . A lot of people run decks that don't have 'destroy target artifact' cards in their main deck as well, they're usually sideboard material. Might try Magma Jet with my other Blue/Red Galvanoth/Delver/Scry deck.
Yeah, if only, it would be great if they did. The spells are cheap enough anyway so I should be able to cast a few a turn which will still give them enough of a bonus and if I've removed the creatures with said spell then they should have a free shot.