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Blank card is Seraph.
This deck is worse than Instosis in almost all respects, but it works. Combo is Arctic Dragon + Seraph + Fractal + 7 more Seraphs + Sky Blitz = (13+12x8)x2 = 218 damage, which means 1- and 2- damage reduction shields won't affect it.
The single Explosion is for when you draw a Sundial on the last turn - you have to play it, or you'll only have 194 damage. If you don't need it for that, you can use it on annoying shields like Diss, Fog and Dusk Shield.