The pupils seek out and find Merlin, and he'll teach the pupil Presto magic, ...
Dungeons & Dragons
Season 1 Episode 1: The Night of No Tomorrow
The pupils seek out and find Merlin, and he'll teach the pupil Presto magic, if he stays with Merlin. Presto decides to stay and attempts a spell to create a way home, but the spell summons dragons instead which attack a nearby village.