Whether or not there's an actual deck here is still up in the air, but if there's a place for this Dinosaur, you can bet people are going to find it
Those cards are considered to be "used to craft" that permanent as long as they remain exiled and the permanent remains on the battlefield, even if the permanent's controller changes or some of its characteristics change (because of a copy effect, for example.) If the materials required include multiple objects, you may exile some of them from among permanents you control and the rest from among cards in your graveyard
Having achieved this, Zeff's second effect (which is similar to ST12-010-emporioivankov's) allows us to play that 2-cost card that is at the top
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In these cases a scan says more than an additional distinction of Mint and Gem Mint
A three-mana combat trick is a big ask, but this will make a huge difference in a race, and because it cantrips, is going to slot nicely into the UB draw-two archetype.