I think this is too ineffective. Fire lance costs 1

only for a minimum of 3 dmg, and a maximum of 24. This will always cost 2

per 3 dmg. Chaining this 4 times will cost 30

and deal 45 dmg. Casting 4 fire lances at 30

will cost 4

and deal 39 dmg. I see no reason why someone would want to chain this instead of casting fire lance.
I suggest you remove the doubling effect of the cost. It is difficult enough to get 4 of the same card in you hand. Might as well alloy 45 dmg for 8

. Unstable gas already does 20 dmg for 5

and 1

only, and is much easier to pull off with 1 card only.