Most of them will be included in our English Evolutions set this November
The Light Test Difficulty: Easy | Reliability: Medium Hold the card up to a strong light source (phone flashlight works)
Absolute Virtue Aettir and Priwen Clive, Ifrit's Dominant Cloud, Midgar Mercenary Cloud, Planet's Champion Emet-Selch, Unsundered Esper Terra Gogo, Master of Mimicry Hades, Sorcerer of Eld Ifrit, Warden of Inferno Kefka, Court Mage Kefka, Ruler of Ruin Lightning, Army of One Sephiroth, Fabled SOLDIER Sephiroth, One-Winged Angel Sephiroth, Planet's Heir Terra, Magical Adept Vivi Ornitier Y'shtola Rhul Yuna, Hope of Spira
Secondly, you can use it to cycle artifacts in and out of the yard those with death or enter triggers, and those that affect all players on upkeeps
Say you have a Sapphire Mufasa on board, already and then play Hades