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Mishra's Workshop produces three mana for artifact spells from a single tap

Once you've announced that you're casting a spell, players can't take any actions until you've finished doing so

And is targeting only one person like that even useful, strategically or politically

Since Polymorph decks are built around cheating creatures onto the field as opposed to casting them, the restriction of not casting permanents is hardly a downside

These effects are powerful because they wont just get a creature from your graveyard directly onto the battlefield, they can often do so at a lower price than that creatures original casting cost