I don't know, whether others tried testing Void Pillars... It get's a bit confusing, but what I said before was the case all the time.
Monos: Dead.... As long as you have more Void Pillars than the total number of Pillars/Pendulums + Mark of the opponent, you will win.
Duos: There are two types here
-Only vague relying on the quantum of the Mark: (Blessed Pegasus deck) Pretty easily wrecks the deck with the speed. Even a bit of slowdown, the Void Pillars are ineffective. Even though the results were this with my previously described Phoenix deck, when playing a control deck, there were no problems (Control deck of 40 cards: 16 Void Pillar, 10-12 Quantum Pillar, 14-12 Control cards).
-Heavily relying on the quantum of the Mark: (Blessed Dune Scorpions) Wrecked... Could do nothing most of the time. If it was good against the Phoenix deck, the Control still killed it....
Rainbows:
-Immolation/Nova: Great way to get around quanta drain, worked great against Void deck.
-Supernovae based decks (rushes mostly): Pretty risky and close games if they can get enough
to play supernovas, also Quantum Pillar/Tower is really useful against Void Pillar, producing 3 quanta gave a big advantage to Rainbow decks.
-Heavy Pillar/Tower decks: As said above, 1 Quantum Pillar compensates for 3 Void Pillars. With a good draw you stand have a good chance and a fair matchup.
-Control decks: Depending on the amount of Pillars involved, stood up pretty well.
Overall of Rainbow decks: It really depended on the Mark. Upped decks struggled to play Supernovas, due to
being destroyed. Upgraded version worked a bit better, but Tower>Supernova against Void decks. For unupped Rainbows it was up to how heavily they depended on the quanta of the Mark. Unupped decks concentrated on
Mark and drawing were seriously slowed down.
I hope this gives a better view on the situation. If anyone want to test it more, PM me.
Would this be a totally new element? It'd be problematic in PvP events (War and all others), since Void decks would be screwed up by Sanctuaries... Though it'd be a different question if other Void cards would be introduced.... Void Pillar is a concentrated Devourer, which doesn't give you quanta, but it's random cost, cheaper and you can pack much more of them in your decks.