This particular card doesn't seem solid at all until we see the rest of the stat. Tyrantus would be a good example of a good beast but outside that, this is way too specialized to be usable. Perhaps, the loa would make this more powerful.
Turn 10 mana Spiritsinger Umbra into this card pulling the obvious Hadronox sounds good to me. One really can't underestimate how vulnerable you are that turn you're forced to play a tempo Hadronox because naturalize isn't getting drawn
In other druid decks, this is yet another card you can play arcane tyrants with for that big tempo swing
Well if there will be more good late game beasts like Tyrantus and Oondasta, I can see this one definitely working out in beast based ramp druid, instead of dragon one that we have right now. Heck even summoning Giant Anaconda, trading it into a minion and summoning another big one is a big tempo play on 6 mana. In general this is a very good card, question is how much support will it get.
Actually not a bad THAT bad of a card, the 6 mana spell used in priest that summons a 5/5 copy was used a lot now i know it is good because of the re summon a dead minion priest thing but this card gives it rush and it has its full stats think abot it witch cards like tyrantus oondasta and the oronhide dinasaour. Druis has a lot of ram especially with biology project and good draw this could work and it could get very annoting if it does. They also have juicy psychomelon to get this card ready and witching hour to keep pressure just in case cards like brawl or twisting nether is used. Think about giant anaconda with rush for one less mana... I could see this working easily just play golems for the early games whihc are not beasts or even ziliax for the late game just writting this gets me excited about big/beast druid for the future very good card for a deck that does not need anything else for it too work besides this card and the legendaries revealed. Just remeber we have yet to see legendaries for druid this expansion and the cards release fit perfectly into this archetype.... scary stuff folks