Idea is to play Mentor witchers to the leftmost side. With 2 or mentors when you'll play Gaetan the mentors will move first to the other row than the other cards and each mentor will get boost equal to the the other cards moved with them.

I said "Cards" not units. So the artifacts will move as well when gaetan is played and mentors get boosts as well.

other good combo is with Sabertooth.

sabertooth transforms selfs. it trascforms into a artifact/unit.

every time in (adrenaline phase of mentors) you click it's order to transform.. the Mentor witcher acknowledges that as you played a artifact and they boosts themselves. Also At the start of the turn sabretooth transforms back into a unit. the Mentor witchers acknowledges that as you played a unit and they again boosts themselves.

milva is OP with Malena/ boar/Frogs/gaetan/cat witcher/Dryad

malena is also great with Mentors as you can use malena to move boar/cat witchers every turn to trigger mentor witchers every turn.