Its designed for Fusion Strike first, as its attack does more damage with that special energy card, but colorless energy requirements mean it might see some play in peculiar scenarios and its a real boon in limited play
Eccentric Robot and Yokai Professor Callaghan dont really do much here either
To determine the best, Im interested in cards that work with what Boros wants
Another of the three hybrid cards has also been graded at 6.5, while the third achieved a higher rating of Near Mint+ 7.5

Draconic Destruction Starter Commander Deck Atarka, World Render | Illustration by Camille Alquier Commander (1) Planeswalker (1) Creature (28) Akoum Hellkite Demanding Dragon Draconic Disciple Dragon Mage Dragonkin Berserker Dragonlord's Servant Dragonmaster Outcast Dragonspeaker Shaman Drakuseth, Maw of Flames Dream Pillager Drumhunter Flameblast Dragon Foe-Razer Regent Furnace Whelp Harbinger of the Hunt Hoard-Smelter Dragon Loaming Shaman Mordant Dragon Rapacious Dragon Runehorn Hellkite Sakura-Tribe Elder Savage Ventmaw Scourge of Valkas Steel Hellkite Thunderbreak Regent Thundermaw Hellkite Tyrant's Familiar Verix Bladewing Instant (8) Beast Within Blossoming Defense Hunter's Insight Magmaquake Provoke the Trolls Return to Nature Spit Flame Unleash Fury Sorcery (9) Chain Reaction Clan Defiance Cultivate Harmonize Hunter's Prowess Primal Might Shamanic Revelation Sweltering Suns Vandalblast Enchantment (6) Crucible of Fire Dragon Tempest Elemental Bond Fires of Yavimaya Frontier Siege Garruk's Uprising Artifact (7) Arcane Signet Atarka Monument Commander's Sphere Dragon's Hoard Sol Ring Swiftfoot Boots Talisman of Impulse Land (40) Cinder Glade Command Tower Forest x12 Game Trail Haven of the Spirit Dragon Kazandu Refuge Mountain x18 Path of Ancestry Rugged Highlands Shivan Oasis Temple of Abandon Timber Gorge I think all of the Starter Commander decks are pretty solid entry points for players

Rotation Preparation Adventures in the Forgotten Realms also marks the last set before Standard rotation this September