MTG Combo: Altar of Dementia + Chronozoa + Solemnity
This generates infinite 3/3 fliers and infinite milling.
Vanishing and Solemnity work well together, anything with Vanishing entering with no counters will never leave the battlefield from an upkeep vanishing trigger. This also means that Chronozoa will always create two token copies of itself whenever it dies, giving you an infinite sac outlet for any no cost sacrifice effect.