No is not,it costs 10 mana and need to survive until next turn for paladin to be able copy it,is strong but slow..usually 10 mana cards if reach the fact of being viable they need to swing game in more impactful manner.
I said it in the card discussion, but imma say it again here: it's a 10 mana card with a strong effect, but realistically this card won't see much play unless there are good ways to cheat it out fast and summoning a bunch of 7/7's is strong but in later stages of the game there is plenty of board wipes to deal with them. Also weak to silence and Sap as ppl pointed out above.
Tell me how many 10 mana cards are in t1/t2 decks these days? Kalecgos comes to mind, but he has a sudden impact most of the time he is played. Spending a whole turn on 10 mana just to play one card is just too much. Just watch the rogue sap it the next turn or the demon hunter ignoring taunt to go face.
It's ok. Pretty good as far as big lads to cheat out go. I wish it was a mech so I could play Oblivitron in standard since Mechanical Whelp is rotating. I'll just have to hand in my special snowflake card until we get something else.
Lacks being untargettable, will see 0 play in anything outside of maybe a necrium apothecary+anka the burried deck. And certainly won't be rocking the meta in any significant way. It's a fun card that I'm glad is in the pool, and is an auto pick in arena, but in standard? Will do nothing.
I'd say there is at least one challenge Colossus and Archmage face that this doesn't. CotM and BBA don't have taunt, and can be completely ignored in favor of an opponent going face. I guess Big Bad Archmage has a chance to random into a 6-drop Taunt, but I think my point stands.
With taunt, and two bodies, this can't really be ignored in the same way. Anyone trying to kill you has to kill this first. It isn't an impossible task for something like Silence or Sap, but it's by no means automatic.
What does that all add up to? One of the closest-to-playable 10 drops in a long while, but still probably not playable.