Protection from blue is a hard ability to evaluate, so I mostly see this as an uncounterable version of a regular X-cost hydra
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Abzan Monument Aether Refinery Alandra, Sky Dreamer Alistair, the Brigadier Arboreal Alliance Baru, Fist of Krosa Benalish Commander Bonehoard Budoka Gardener Budoka Gardener Chainer's Torment Convert to Slime Corpse Cobble Corpseweft Dance of the Tumbleweeds Effluence Devourer Experimental Overload Field-Tested Frying Pan Flesh Carver Formless Genesis Garruk, the Veil-Cursed Geralf, Visionary Stitcher Ghalta and Mavren Grakmaw, Skyclave Ravager Inscription of Insight Jiang Yanggu Jolrael, Mwonvuli Recluse Jyoti, Moag Ancient Katara, Water Tribe's Hope Kate Stewart Kin-Tree Invocation Kinbinding Kresh the Bloodbraided Avatar Krumar Initiate Kura, the Boundless Sky Luxurious Libation Manaform Hellkite Marath, Will of the Wild Mask of the Jadecrafter Metallurgic Summonings Miming Slime Minsc, Beloved Ranger Mystic Genesis Nissa, Ascended Animist Ooze Flux Ooze Garden Oviya Pashiri, Sage Lifecrafter Phantasmal Sphere Phyrexian Processor Phyrexian Rebirth Profane Transfusion Promise of Power Pure Reflection Quartzwood Crasher Rapid Prototyper Reign of the Pit Riptide Replicator Rootha, Mastering the Moment Rootwire Amalgam Seed Guardian Severance Priest Shark Typhoon Skyclave Apparition Slime Molding Smoky Lounge // Misty Salon Smoky Lounge // Misty Salon Spoils of Blood Staff of Titania Starnheim Unleashed Stitcher Geralf Sylvan Offering Tangleweave Armor

Depends on the deck
Theyre all Exhaust abilities, which means you can only use them once per game. This sounds like a major downside, but it doesnt apply if you blink or bounce Loot and start a new instance of him