It originated with Flicker, inspired by phasing cards
Now, a barrage of upkeep triggers from Subversion and Palace Siege wont exactly lead to an engaging play experience, but they do reinforce a unique take on the archetype: slowly draining the table until one player finds themselves at a slightly lower life total than the others
And you can cleave it for three mana to counter anything, and it's a flavor hit
Cloud, Ex-SOLDIER (Limit Break) Cloud, Ex-SOLDIER leads the red-green-white Limit Break deck that focusses on equipping weapons, raising your stats past 7 power. Thematically, it ties well into Final Fantasy 7 and its Limit Break system, with the deck allowing you to buff your creatures with equipped weapons, and then gain certain abilities based on this power
I would speculate there are some dealer-sellers easily clearing multiple six-figures per month selling high-end slabs (graded cards) or collections given the current climate
Make sure you also check out the Shimmering Skies Card List for a list of all 223 cards