The only three-color combination that has just 2 1000 decks is the one shard centered on Red and its allies
However, disruptive effects which can simply destroy "Magician of Faith" without being flipped, the increasing number of cards which can only use one copy and/or effect per turn, and overall recent builds which doesn't really need to retrieve a "Mind Control" as they can easily find another way to get out of a tight situation is not that "Magician of Faith" became less reliable, but rather far less necessary compared to the old times where variety was scarce

Mono-Green Elves | Gladiator | Mindmage Creatures (28) 1 Allosaurus Shepherd 1 Beast Whisperer 1 Crashing Drawbridge 1 District Guide 1 Dwynen's Elite 1 Elder Gargaroth 1 Elvish Archdruid 1 Elvish Clancaller 1 Elvish Visionary 1 Evolution Sage 1 Imperious Perfect 1 Incubation Druid 1 Llanowar Elves 1 Llanowar Visionary 1 Marwyn, the Nurturer 1 Oakhame Adversary 1 Oakhame Ranger 1 Oracle of Mul Daya 1 Paradise Druid 1 Pelt Collector 1 Reclamation Sage 1 Selvala, Heart of the Wilds 1 Steel Leaf Champion 1 Thorn Lieutenant 1 Wildborn Preserver 1 Wildheart Invoker 1 Woodland Champion 1 Wren's Run Vanquisher Planeswalkers (5) 1 Garruk, Unleashed 1 Nissa, Who Shakes the World 1 Vivien Reid 1 Vivien, Champion of the Wilds 1 Vivien, Monsters' Advocate Instants (8) 1 Assure // Assemble 1 Bounty of Might 1 Once and Future 1 Pulse of Murasa 1 Return of the Wildspeaker 1 Shared Summons 1 Slice in Twain 1 Veil of Summer Sorceries (6) 1 Explore 1 Finale of Devastation 1 Find // Finality 1 Nylea's Intervention 1 Prey Upon 1 Primal Might Enchantments (5) 1 Growing Rites of Itlimoc 1 Guardian Project 1 Path of Discovery 1 Song of Freyalise 1 Wilderness Reclamation Artifacts (8) 1 Heraldic Banner 1 Herald's Horn 1 Icon of Ancestry 1 Rosethorn Halberd 1 Shadowspear 1 The Great Henge 1 The Ozolith 1 Vanquisher's Banner Lands (40) 38 Forest 1 Castle Garenbrig 1 Tranquil Thicket Basically, almost nobody plays Gladiator to play aggro

8 Eriette's Tempting Apple Most Food lets you pay two mana and sacrifice it to gain three life, but Eriette's Tempting Apple also lets you burn an opponent for three life as well
I can edit to make it only put 1/turn if necessary, but it usually just draws 2 if your hand/field so happens to allow such an act