

This can't be played if you've played another A Horrible Night this turn.
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For the rest of this turn, whenever your leader loses defense, deal 1 damage to each enemy leader and give your leader
+1.
QIf I play Urias, Final Vampire's On Evolve ability and choose option 1 when my leader has 1 defense, do I lose the game before this spell gives my leader +1 defense?
AYes. Confirmation Timing occurs after Urias's On Evolve ability resolves, at which point your leader has 0 defense.
QIf I play Urias, Final Vampire's On Evolve ability and choose all three options, does this spell's "whenever your leader loses defense" ability trigger 3 times?
AYes, it does.