Duello Magico (Mage Duel)
Duello Magico 

Una creatura bersaglio che controlli prende +1/+2 fino alla fine del turno. Poi lotta con una creatura bersaglio che non controlli. (Ogni creatura infligge all'altra danno pari alla propria forza.)
Testo delle regole (Oracle, inglese)
Target creature you control gets +1/+2 until end of turn. Then it fights target creature you don't control. (Each deals damage equal to its power to the other.)
"Ricorda le regole. Niente magie in faccia!"
Legalità
Chiarimenti sulle regole (in inglese)
2021-04-16
To determine the total cost of a spell, start with the mana cost or alternative cost you’re paying, add any cost increases, then apply any cost reductions (such as that of Mage Duel). Mage Duel’s mana value is always 3, no matter what the total cost to cast it was.
2021-04-16
You can’t cast Mage Duel unless you choose both a creature you control and a creature you don’t control as targets.
2021-04-16
If the creature you control is an illegal target as Mage Duel tries to resolve, that creature won’t get +1/+2. If that creature is a legal target, but the one you don’t control isn’t, your creature will still get +1/+2. In both cases, no fight will happen and no creature will deal or be dealt damage.