And if you ever stick equipment or a counter on it, the tax becomes even worse
Also, since this is a Commander-only card, it gives us no indication as to whether or not adventures will be a main set mechanic
(6/6/2025) The top card of your library isn't in your hand, so you can't cycle it, discard it, or activate any of its abilities that could be activated from your hand
Instead of Demonic Tutor, could you run Diabolic Tutor (4 mana, not a Game Changer)

Scientists Aang's Journey Absorb Vis Abzan Monument Academy Rector Aerial Surveyor Agency Outfitter Ainok Guide Ajani's Aid Alabaster Host Intercessor Alpine Guide Alpine Houndmaster Altar of Bone Ambitious Farmhand Amrou Scout Analyze the Pollen Anchor to Reality Ancient Excavation Angel of the Ruins Angel's Herald Angrath's Fury Arachnus Spinner Archaeomancer's Map Archdruid's Charm Archmage Ascension Arena Rector Arid Mesa Armillary Sphere Artificer's Intuition Ash Barrens Ashiok's Forerunner Asmoranomardicadaistinaculdacar Assembly Hall Atalan Jackal Attune with Aether Auratouched Mage Aurochs Herd Avarax Axgard Armory Ayara's Oathsworn Bad River Balamb T-Rexaur Bant Panorama Basri's Aegis Battalion Foot Soldier Battle Plan Beamsaw Prospector Beanstalk Giant Beanstalk Giant Bebop, Warthog Warrior Bedhead Beastie Begin the Invasion Behemoth's Herald Behold My Grandeur Behold the Beyond Beneath the Sands Beseech the Mirror Beseech the Queen Bifurcate Bilbo, Birthday Celebrant Binding the Old Gods Bioengineered Future Biomechan Engineer Biotech Specialist Birthing Pod Bitterheart Witch Bitterthorn, Nissa's Animus Black Chocobo Blighted Woodland Blightspeaker Blood Speaker

If an effect exiles Summon: Esper Maduin and then instructs you to return it to the battlefield, it remains face up in exile (unless that effect instructs you to put it onto the battlefield transformed, in which case it returns as Summon: Esper Maduin)