For rebacked cards you can usually use the bend test (which will usually cause the two pieces to separate a bit near the crease)
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As opposed to transforming your own weak creatures, you get to transform your opponent's powerful ones
Fabricate Fabricate is one of the cleanest and most reliable tutors in any artifact-based deck
More usually, things are closer to wide open as far as formats go, and I would basically play everything
Like Ob Nixilis, foils will be juicy targets