I don't see the thematical reference to Light. Gravity was totally fine (pressuring something together and throwing it away). Saying that this has some synergy with Discord is so wrong, if you try to build DBH yourself, you will notice the low room of support cards that you can fit in. You will never use this there, unless you want a non-creature finisher, using your built-up entropy quanta. Btw, upped DBH usually plays Discord on turn 1, sometimes 2, and even unupped on turn 2, unless you have a bad draw. Squeezing this card in won't make your draws any better, not to say the weak effect in early game, the quanta cost and the self-damage.
Also, I like how you solved the damage issue. It looks like a good burst card in an offensive Gravity deck, somehow comparable to Nightmare for that case (fast damage, more or less one-time-use), and seems like a good counter to fuel-Bolt-decks and Dissipation-stalls.