Killing it is no good, seeing as it returns to the battlefield and draws a card when it dies, making opposing removal spell look useless
Though its not a unique card, given that its the exact same Kristoff, Reindeer Keeper thats card number 13 in Shimmering Skies (at least in terms of its printed stats and abilities), theres a unique foil treatment to this card, which also lacks the black border around its Lore symbols
Note the image isnt official, and comes from a preview found by sergiorips
9 The Islands I Pulled From The Sea 216/204, Ruby The first song card on this list, the Uncommon card The Islands I Pulled From The Sea will let a character that costs three or more sing
While that's not the most terrible idea, the likelihood in a Niv-Mizzet deck is that the other spell you're casting is a burn spell that could do the same, and I have to feel that you're going to be better off casting it by itself, rather than putting all your eggs in one basket
Will that be good