Unicorns are Unicorns
The main problem is that most Dragon decks are already full to the brim with excellent cards, so it'd be hard to justify cutting cards to make room for this one since it's a lot more situational than Dragons' usual fare

The Tarrasque | Commander | Stephen Johnson Commander (1) 1 The Tarrasque Creatures (28) 1 Allosaurus Shepherd 1 Arbor Elf 1 Bane of Progress 1 Birds of Paradise 1 Boreal Druid 1 Destiny Spinner 1 Drumhunter 1 Elvish Mystic 1 Eternal Witness 1 Fyndhorn Elves 1 Ghalta, Primal Hunger 1 Gigantosaurus 1 Goreclaw, Terror of Qal Sisma 1 Krosan Drover 1 Llanowar Elves 1 Managorger Hydra 1 Nylea, Keen-Eyed 1 Old Gnawbone 1 Ornithopter of Paradise 1 Pathbreaker Ibex 1 Prowling Serpopard 1 Solemn Simulacrum 1 Steelbane Hydra 1 Suspicious Bookcase 1 Sylvan Caryatid 1 Timeless Witness 1 Verdant Sun's Avatar 1 Whiptongue Hydra Planeswalkers (2) 1 Garruk, Primal Hunter 1 Nissa, Who Shakes the World Instants (8) 1 Berserk 1 Heroic Intervention 1 Hunter's Insight 1 Momentous Fall 1 Predator's Rapport 1 Ram Through 1 Return of the Wildspeaker 1 Veil of Summer Sorceries (14) 1 Cultivate 1 Finale of Devastation 1 Fungal Sprouting 1 Hunter's Prowess 1 Kodama's Reach 1 Life's Legacy 1 Monstrous Onslaught 1 Nature's Lore 1 Overwhelming Stampede 1 Rampant Growth 1 Rishkar's Expertise 1 Soul's Majesty 1 Three Visits 1 Traverse the Outlands Enchantment (1) 1 Greater Good I don't know if there's much point to trying to power this list up, but if the price tag feels like it's a bit much you would want to drop out cards like Allosaurus Shepherd and Jeweled Lotus

However, most arent worth more than $20-$50
Balancing for Retro Artifacts We are looking forward to seeing what new dynamics The Brothers' War and its retro artifacts will bring to the Historic format, with one exception: Mishra's Bauble
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