Err.... four earth pendulums? And upped too? The first thing about your deck is that you should generally have a small 30 card deck. That means removing the unnecessary cards like ash eaters. Fire shield is quite expensive at 6
, so you should remove one of those. You wouldn't need rain of fire if you already have fire bolts, so you can take that out as well. Fire spirits and rage potion can be replaced with fire pillars for more quanta generation. Generally, your deck should have a focus, like one specific creature that it focuses around on.
Here's a sample fire deck I made on the spot:
Hover over cards for details, click for permalink
5f0 5f0 5f0 5f0 5f0 5f0 5f0 5f0 5f0 5f0 5f0 5f0 5f0 5f0 5f0 5f0 5f2 5f2 5f2 5f2 5f2 5f2 5f4 5f4 5f4 5f6 5f6 5f7 5fc 5fc 8po
Here, dragons are the main focus, and you have enough fire pillars to play them when necessary. Phoenixes are weaker than dragons, but more sturdy. Mix and match them until you find a combo that you are familiar and enjoy playing wiht.