I like the flavour of Gravity Sphere and the artwork in Caverns of Despair
The ergonomic handle is a nice touch, angled perfectly for comfort and tested to reduce strain, so you wont dread carrying it
And consider how they can create a winning strategy
Effects that modify a creature's power and/or toughness, such as the effect of Jump Scare, will apply to that creature no matter when they started to take effect
Bouncing a land with the Chancery
Finally, the deck has a ton of removal spells and counterspells to help you keep opponents at bay in the early game, card draw effects, and a ton of different synergies when Toxrill starts taking down your opponents' armies (such as drain effects when their creatures die, reanimate effects, card draw, etc)