This is a blue uncommon that lets you play an instant or sorcery for free, mill a few cards, and then play another instant or sorcery in your graveyard to boot
The other trouble creature type was Wall, because at the time Walls essentially all came with defender
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[37] These restrictions are usually imposed for balance-of-power reasons but have been occasionally made because of gameplay mechanics
This makes it a maindeckable card in most green decks and thus a nightmare for graveyard opponents who have a hard time playing around the potentially free spell
