Well, it looks like quantum pillar is allowed if you want, although I can only imagine maybe one deck under these rules that could actually make use of it.
As for the trios, you will by necessity need three elements due to the spells, permanents, and creatures having to come from 3 different elements, no more and no less, but it looks like your pillars/pends could come from other elements if you wanted, at least the way the rules are written, i.e. the following deck would be legal: (horrible on purpose so nobody can say I helped you build a deck, only to understand the rules as written :p)
5 flooding
5 aflatoxin
4 graviton mercenary
1 armagio
1 of every pillar/pend