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If each target chosen is an illegal target as that spell or ability tries to resolve, it wont resolve

Ursula also pairs perfectly with Lucifer - Cunning Cat, often clearing the way for his enters play ability to hit two cards, since typically the single action your opponent would discard is a Song

With all the utility lands that are in a land deck, thats where I reckon well see this most

seem to fit the infect theme better, and with it being G/B i'd say Zombies or Insects

The exile clause is the most important part about this card, which is super useful for getting rid of cards like Memory Deluge, Squee, Dubious Monarch permanently