The melded version isnt a human, but its tokens are bigger and its attack trigger can also be doubled, so why not
In Avacyn Restored , we tried a mechanic called forbidden where cards could be shuffled into your deck, and in Kaladesh , we experimented with a mechanic called invention where you pull in artifact cards from outside the game to your hand
In short, Ragnarok is totally overpowered, but to actually execute on the meld can be challenging
Back to Far Out, here's the interesting part: There was a poll not too long ago from Mark Rosewater, head designer of Magic: The Gathering, asking players about their opinions on un-set card printing legality in tournaments, hinting that there may be a reprinting of a former un-set card in a standard legal set
If the target opponent is an illegal target as Tataru Taru's first ability tries to resolve, it won't resolve and none of its effects will happen