So this can copy your opponent's instant and sorceries if they come under the 4 CMC caveat
They're legal in draft and sealed decks and are otherwise only legal in formats where they were already allowed , just like Masterpieces
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The mana cost may be significantly higher, but it rarely matters as youre likely going to have mana to spare on any given turn
You can cast it large, or you can cast it small, but no matter what, you wind up with a cost-efficient creature
Instead, you cast this tricky little blighter and your foe is forced to just draw one card, with you getting to draw a card for your troubles