Maybe a OTK or a rainbow with control that is unnupped like this?:
Hover over cards for details, click for permalink
4sa 4sa 4sa 4sa 4sa 4sa 4sa 4vh 4vj 4vj 4vj 4vj 4vj 4vj 55r 590 590 593 5c1 5c1 5f6 5f6 5ia 5ol 5rl 5rl 5up 61q 6tt 713 8ps
A couple of changes I'd suggest:
1. Drop the hourglasses for Precogs/Sundials. This is a rush, a control rush, but a rush nonetheless, and trying to pull out an hourglass
unupped and have it work is 6 time quanta right there, which is a lot. You'll likely only get 1-2 uses and only 1 hourglass out, despite your mark of time (don't forget about the extra 2 time from your graboids!). Precogs are similiar, cheaper, and let you see their hand to boot.
2. Owl's Eye is very useful, but very expensive. Again, you'll only get a few uses out of its expensive ability, if any at all. Vamp Dagger/Arsenic/Discord are the usual choices for a speedbow.
3. Two Graboids and an Earthquake is a whopping 9 earth quanta. Earthquake is usually the most useful in the early game, when only 3-4 pillars are out and you can quickly stop their quanta gain. If you insist on Earthquake, drop the ever useful Graboids and add a Black Hole so you can nail their quanta for a few turns.
4. Purify is probably unneeded, poison decks in Silver are not too common. However, I don't know the frequency of SPLAT decks, so maybe it could be useful.
Feel free to ignore any or all of these suggestions. I've not tested the deck, so I can't say if it works or not. But it looks similar to other Speedbows so I think it would be fine.