Setting up entire combos around creatures leaving and re-entering might sound a bit pointless until you remember the myriad enter the battlefield (ETB) triggers found in a huge number of creatures
Presumably, then, there'll be a fair few shrine cards, though we wouldn't say it's 100% guaranteed
Use a treasure and spend to cast Ozox again and repeat for infinite treasure, death triggers, ETBs, and more
While most resources of this variety keep you from losing, there are a few niche cases involving resources that also fall under this umbrella
Armoroid X EARTH Level 8 [ MachineEffect ] ATK 2700 DEF 2000 If this card is Tribute Summoned by Tributing at least 1 "roid" monster: Banish all Spells and Traps on the field
That card is usually filler, but it was great here, as I could spend 1 energy on it, then 3 energy on something else like Phyrexian Ironworks to draw a card off Izzet Generatorium