Characters
Conjuring? Will, let's be realistic here, okay? Your basic spells are usually only about 50-50.
— Buffy ‧ Buffy the Vampire Slayer

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
Faced with a suggestion to conjure, the speaker responds with a deadpan reality check. Calling ordinary spells only about even odds turns magic into a coin toss, gently deflating the confidence of the person proposing it and urging a more sober look at the risk.
Context reviewed