Cards like Spirited Companion, Deadly Dispute, and Kor Skyfisher are great for triggering it reliably while that scaling ward tax makes Minthara harder to remove as it grows stronger
Mirror Mastery Commander (1) Planeswalker (1) Creature (24) thersnipe Animar, Soul of Elements Artisan of Kozilek Avatar of Fury Baloth Woodcrasher Chartooth Cougar Conundrum Sphinx Deadwood Treefolk Edric, Spymaster of Trest Elvish Aberration Faultgrinder Fierce Empath Hydra Omnivore Intet, the Dreamer Krosan Tusker Magmatic Force Magus of the Vineyard Nucklavee Rapacious One Simic Sky Swallower Spitebellows Trench Gorger Valley Rannet Veteran Explorer Instant (9) Brainstorm Tribute to the Wild Colossal Might Invigorate Spell Crumple Electrolyze Ray of Command Prophetic Bolt Hunting Pack Sorcery (13) Collective Voyage Hull Breach Cultivate Kodama's Reach Firespout Ruination Explosive Vegetation Chain Reaction Death by Dragons Vengeful Rebirth Disaster Radius Call the Skybreaker Savage Twister Enchantment (3) Vow of Flight Vow of Lightning Vow of Wildness Artifact (6) Sol Ring Armillary Sphere Gruul Signet Izzet Signet Lightning Greaves Prophetic Prism Land (41) Command Tower Evolving Wilds Forest x13 Fungal Reaches Gruul Turf Homeward Path Island x7 Izzet Boilerworks Kazandu Refuge Mountain x8 Rupture Spire Simic Growth Chamber Temple of the False God Vivid Crag Vivid Creek Vivid Grove Commanders, Themes, and Strategy Mirror Mastery is the Temur deck and does classic Temur things like duplicate spells and cast big creatures
Universes Beyond Commander precons like these usually prioritize new cards over reprints
Once flipped, Lightshield Array grows your attacking creatures each turn, and provides a great protection ability
These two white cards can form the base of a planeswalker control deck that I think will be very good in Standard
