This deck does not rely on perfect draws. However, it does rely on being able to correctly balance things. For instance, if you play sundials too early, your chain might break and then you get alpha-struck into the ground (this happened to me once vs. Gemini...ow ow ow my face D: ), but not too late such that you're at some low amount of life and then you get ended by a weapon (Titan, Eagle Eye, Fahrenheit).
Furthermore, you need to be able to balance enough fire quanta to get critical breakpoint right before you deck out, while also balancing to be able to draw your light splash in time to make use of your sundial draw in order to chain them together.
Also, you need to be able to manage your hand size. Generally, you want to keep drawing cards so you can always be sure your sundial chain will keep going (otherwise you most likely flat out lose), because at the end, you can just play sundials without using their draw ability to slow down a little, but essentially, there are maybe 3 cards total which you can actually afford to discard. (Explosion, Miracle, Reflect Shield)
The problem with the unupgraded version is that you'll probably miss key breakpoints, such as the necessary 111 fire quanta needed for 201 damage.