A risky, dangerous dungeon that promises great power
Like most Magic: The Gathering cards, the value of Omniscience depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Amonkhet Invocations)
Its worth making the effort to draft any dual lands that can tap for at least one of your main colors, since at bare minimum it upgrades Artillery Blast into bargain removal
Give Non-Glare a try and you may just find a new favorite sleeve
The Master of Keys The Master of Keys is a cellarspawn who is able to use the House's doors as thresholds not just between adjacent rooms but unconnected rooms as well
Aether Hub, Harnessed Lightning, Glint-Sleeve Siphoner, and Whirler Virtuoso are all fine energy-based cards that can be played outside of a true energy sub-theme