This opens up a lot of power very easily as long as you build the deck well, and should lead to an interesting balance of Artifact spells and fodder to make more Golems
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It was a real heavy hitter in Standard for exactly this reason: no matter when you drew it, it was almost always relevant
You may cast that spell without paying its mana cost, then put the other cards exiled on the bottom of your library
Enchantment Dragonhawk, Fate's Tempest Flying Whenever Dragonhawk enters or attacks, exile the top X cards of your library, where X is the number of creatures you control with power 4 or greater
This little Pikachu Squishmallow can be clipped onto either, and might I say that it'd look mighty fine attached to a stocking on the morning of a certain holiday