I'm not really a fan of cards that are meant to be used specifically with one other card. Rustler, for example, works with not only FFQ, but also fireflies+fractal, luciferin, Rays of light, a light nymph, etc. This card ONLY works with animate weapon, so I vote no.
What about if playing another one of these with one already in your weapons slot makes the previous one automatically fly (cuz shurkens fly), but maybe only last 2-3 turns, so you keep playing shurikens as they die, and they all deal extra damage, so it's like a shuriken barrage? That's an idea I can totally get behind, as long as it's nerfed to only be overpowered with several shurikens in play. I love the idea, and I think this would make it really work ^_^
Great job.