On its own, Arachnogenesis fogs an attack and leaves you with a pile of spider tokens
There's also a few powerful non-cantrip card draw: Skullclamp is a no-brainer in this Go Wide deck, and Wheel of Fortune is always great if you can afford a copy
I definitely wouldn't recommend adding Doubling Season to this deck
Its especially powerful in EDH where you can draw six cards across your opponents turns, which makes it a strong ramp payoff in GU
It works in combos the same way most mana rocks do, including cards like Trazyn the InfiniteTrazyn the Infinite, Myr WelderMyr Welder, and Voltaic ConstructVoltaic Construct if you animate it
The cuteness factor attached to the infamous duo was short-lived, though, with prices of the Baldurs Gate planeswalker dropping significantly following the launch of the set