In short, Ragnarok is totally overpowered, but to actually execute on the meld can be challenging
The melded version isnt a human, but its tokens are bigger and its attack trigger can also be doubled, so why not
If you have any sacrifice outlet in play, such as Phyrexian Altar, you can then generate card advantage by sacrificing opposing creatures
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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
But know, it's a great card due to its versatility