Although the Human is an attacking creature, it was never declared as an attacking creature
Watch out though Cogsworth doesnt have resist himself, meaning you are likely going to want to leave him readied so that your opponents can only take him out with a Be Prepared or by spamming Grab Your Sword and Tinker Bell Giant Fairy
If you just want a clean, straightforward one-turn kill, Chandra's Ignition is a pretty good option, able to smite every creature and player in such dramatic fashion that they probably won't really mind
GLEAM AND GLOW is the best healing effect in the game by a mile, allowing you to heal 3 damage (from a single character) and draw 3 cards
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You also could go with higher costed things, like Grave TitanGrave Titan and Abhorrent OverlordAbhorrent Overlord if you wanted to play a slower game with our Fabled SOLDIER, but I much prefer being on the board quickly and early, that way we have the highest chance of flipping ASAP