Choose two target creatures that share no creature types. Those creatures fight each other. (Each deals damage equal to its power to the other.)
Zoltan Boros & Gabor Szikszai
The two creatures may be controlled by the same player.
If, by the time Rivalsâ€™ Duel resolves, an effect has caused the two target creatures to share a creature type, Rivalsâ€™ Duel doesnâ€™t resolve for having no legal targets.
If either one of the creatures leaves the battlefield before Rivalsâ€™ Duel resolves, no damage is dealt to or by the remaining creature. If both creatures leave the battlefield before Rivalsâ€™ Duel resolves, the spell doesnâ€™t resolve for having no legal targets.
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