This cube is a showcase for the flashiest and most expensive cards I own. I've made exceptions for certain cheap cards that I consider humorous, interesting, or important.

This cube contains infinite combos; currently, they are:

Splinter Twin:
-Splinter Twin
-Kiki-Jiki, Mirror Breaker
-Restoration Angel
-Pestermite
-Deceiver Exarch

Thopter Sword:
-Thopter Foundry
-Sword of the Meek
-Urza, Lord High Artificer

Persist:
-The Great Henge
-Woodfall Primus
-Murderous Redcap
-Yawgmoth, Thran Physician
-Carrion Feeder
-Rhythm of the Wild

Heliod:
-Heliod, Sun-Crowned
-Walking Ballista

Zirda Monolith:
-Zirda, the Dawnwaker
-Basalt Monolith
-Grim Monolith
-Rings of Brighthearth

And, while not technically infinite, Dark Depths combo is possible:
-Dark Depths
-Vesuva
-Thespian's Stage
-Vampire Hexmage