Harmful permanents are obviously determined by the decks. Weapons if PC or CC is a big problem against your deck, shields if your opponent chains them, and maybe even mindgate if you have key cards you don't want your opponent to get.
Two things
1) Effect should probably be "non-pillar/pendulum", or a "quarta generating permanent"
2) I also don't like the random cost very much. Some more descriptions would be nice. Does it mean a random
quarta, or any quarta in general? What is the min / max cost? What happens if you only have 1 or 0 quarta?