I have a lot of the pieces being talked about here, some other counter support, and I've (temporarily) made some additional swaps to include more of the pieces discussed above
On the other hand, if there's a reasonable chance you'll have a Human on the battlefield, Dire Tactics is the least conditional and most powerful two-mana removal spell we have in our current Standard format
Additionally, you might also want to focus on the fact that Arabella is an Artifact Creature and add some cards to take advantage of this such as Darksteel Forge (an expensive card at 9 mana, but a way to make all Artifacts indestructible) or cheaper pieces such as Voltaic Key which allow you to untap Artifacts for just 2 mana total
Sure, you can scry the next plane to help figure out what would be the best for you, and thats a good thing
Cards from Known Planes The Puzzle of Basri Ket If youve read my other set reviews, youll know that I often use different clues on cards, such as flavour text and proper names of known characters, to figure out where a card is set
These Spells Are Epic, Man (Enduring Ideal, Eternal Dominion, Neverending Torment, Undying Flames, Endless Swarm) Playability: A Depth: C Resonance: B (for uniqueness) Heres an oddball group