Stregoneria
Scegli una creatura bersaglio che controlli e una creatura bersaglio che non controlli. La creatura che controlli prende +2/+1 fino alla fine del turno se è un Cavaliere. Poi quelle creature lottano l'una con l'altra. (Ogni creatura infligge all'altra danno pari alla propria forza.)
If the creature you control is an illegal target as Joust tries to resolve, no creature gets +2/+1. If that creature is a legal target but the creature you don't control isn't, it still gets +2/+1 until end of turn if it's a Knight.
You can't cast Joust unless you choose both a creature you control and a creature you don't control as targets.
The target creature you control gets +2/+1 only if it's a Knight as Joust resolves. It'll still fight if it doesn't get +2/+1.
If either target is an illegal target as Joust tries to resolve, neither creature will deal or be dealt damage.