Four out of the six blocks on a Planar die are blank
Not only is Mirrorjade an absolute unit of a card, but if your opponent figures out a way to remove it from the field, all of your opponents Monsters will be destroyed at the end of the turn
Of course, there are some high-synergy cards that you probably want to make room for in your Urza deck: Etherium SculptorEtherium Sculptor and Foundry InspectorFoundry Inspector, Sai, Master ThopteristSai, Master Thopterist, Thought MonitorThought Monitor, the monocolor Urza, Lord High ArtificerUrza, Lord High Artificer, Urza's SagaUrza's Saga, and at least four artifact lands
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You must assign at least enough damage to the first blocking creature to destroy it before you can assign damage to the second one, and so on
This card is slightly rarer than standard variants and appeals to collectors who focus on duo or team cards