While the old blue-red control-based Twin archetype has died off, Kiki-Jiki persists, enabling infinite combos in Naya creature strategies and threatening general value alongside creatures with enter-the-battlefield abilities
The instant effects of action cards - which are discarded once activated - makes them some of the most exciting cards in Lorcana
Destroying all lands (even just nonbasic ones), while not as common these days as it used to be in the world of Magic, is still a potent effect, and Ruination does the job extremely well
The ETB that gathers a food and the bit about being a giant deathtoucher make this a late-game beast that demands respect, and is quite useful if you can turn it into a beast of burden
However, even though the Archaic enjoys some moderate popularity, I dont think this Avatar is nearly popular enough