Magician's Secrets

Use Grasping Manifestation (speed 309, moves 1/2/-), Mail Mental (moves 2/1/2), and Eye of Observation (moves 2/2/1). Open with Tentacle Slap until Lesser Charged Gale dies, then use Illusionary Barrier first against Lesser Twisted Gale before switching to Mail Mental for Hate Mail and Snail Mail into Express Delivery on repeat. Bring in Eye of Observation last and use Eyeblast, Blink Strike, then Counter Spell.

Use Abyssius with Crush, Scorched Earth, and Meteor Strike; Enchanted Pen with Quills, Evanescence, and Forboding Curse; and Lunar Lantern with Beam, Flash, and Light.

Use Servant of Demidos (moves 2/2/1), Enchanted Pen (moves 1/1/1), and Enchanted Broom (moves 1/2/1) as a backup. Open with Lightning Shield, then Siphon Anima, then spam Arcane Explosion with Servant of Demidos. Switch to Enchanted Pen and use Forboding Curse, Evanescence, then spam Quills until the fight ends.

Use Empowered Manafiend (moves 1/1/1) and Minfernal in an H/P breed (moves 1/1/1) along with a third Magic pet of your choice.

Use Sticky Oozling in H/P breed (moves 2/2/1), Void Shardling in H/P breed (moves 1/x/1), and any third Magic pet with at least 280 damage on its primary attack. Open with Moonfire then spam Nether Blast until Dilbert is blinded.

Continue challenging the remaining Master Tamers on Kul Tiras and Zandalar with your level 25 Magic pets until you have defeated a total of 15, at which point the achievement completes.