Mentor: Give the Student Aegis.
Aegis - Aegis protects a unit or player from one enemy spell or effect. It doesn't block friendly effects, nor does it stop battle damage from Killer attacks, Relic Weapons, or normal attack and blocking.
Mentor - Cards with Mentor have an additional effect when played if you exhaust one of your students as a Student. Units that are already exhausted can't be used as a Student.
Student - Interacts with Mentor