Generally speaking, you can do better than cards that just prevent damage for the turn and do nothing else
It's first ability is a Ravenous Chupacabra
This isn't to say that Nadu also didn't deserve a ban due to it's power level, as it was a top deck played at the highest level of competitive Commander (aka CEDH)
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Assert Authority Blinkmoth Infusion Broodstar Chiss-Goria, Forge Tyrant Chromescale Drake Demonic Junker Don & Raph, Hard Science Emry, Lurker of the Loch Ethersworn Sphinx Frogmite Frogmyr Enforcer Furnace Dragon Furnace Hellkite Gearseeker Serpent Icebreaker Kraken Imskir Iron-Eater Into Thin Air Krang, Master Mind Lens Flare Memory Guardian Mycosynth Golem Myr Enforcer Panther Robot Plated Onslaught Quicksilver Behemoth Qumulox Reality Heist Refurbished Familiar Saheeli, the Gifted Sami, Wildcat Captain Scale of Chiss-Goria Slag Strider Sojourner's Companion Somber Hoverguard Steelfin Whale Tezzeret, Master of the Bridge Thought Monitor Thoughtcast Tooth of Chiss-Goria Utrom Monitor Valkyrie Aerial Unit Voyage Home
You drop it on the fourth turn and then it's got 4 loyalty