in an ideal scenario, the minions with blindspots have larger champions backing them up, but then those same larger champions needing to trade for a lilith/pyro becomes a larger problem. I think the reason pyro was placed at 10 cost was to raise the threshold for number of units that can even contest it, and make trading something like berserker/legionary/warrior/knight favorable instead of roughly even. So, james is probably right that it needs a tier shift or moveset improvements rather than cost reduction.