this seems way overpowered, why carry pillars when you could carry this for much better?
You can only carry six rush compared to unlimited pillars and you cannot play it without a quanta to spend so the net gain is only 1 for playing the card over a pillar and you may have to wait past the first turn to play the rush. In its Upgraded version and amongst other towers you get a net gain of 2 straight away.
Problem is the pillar always matches your mark so you have another stack to protect if running towers, you cannot use a Quantum tower in that slot for Rainbow. If using your mark to fuel an off activator you cannot get the tower you need for you main fuel.
Yes you want to use this card over pillars in some situations especially Mono and Duo.
but then again have an upped tower and this and then youve got plenty of mana, its like super nova but giving you only mana you want then giving you a pillar
You have no Mana in Elements.
Nova gives 12 Quanta gain for 1 card use. Immediate Net Gain 12
Rush gives you 3 Quanta gain and 1 until end of game at a cost of 2. Immediate Net gain 1.
Nova fills all Quanta types, Rush only fills 1 or 2. The pillar is locked to your mark so you are already producing that anyhow and the Rushed Quanta has to be a match with what you need at the time. It can be more useful than Nova but it will not replace nova.
Nova/Quantum Rush, QT/Quantum Rush make the cost negligible. This is basically a Dark Ritual (https://www.coolstuffinc.com/images/Products/mtg%20art/Tempest/Dark%20Ritual.jpg) with the added benefit of gaining a pillar of your mark, which is a HUGE benefit. I would abuse the heck out of this card.
It is similar to Dark Ritual but the Ritual is always Acceleration in an environment where the first turn always limits you to one resource. In elements you can drop as many pillars as you like and a open start with 6 pillars will give you a massive head start. Playing the rush trades card advantage for clean quanta production and slight acceleration. This already exists with Photon/Immolation, Nova, Super Nova. I know that its faster than the current normal for Mono|Duo, it was designed that way. I don't think its faster than the Pillars Power starts we already have. If it is can you show me a deck to test with please?
With this card, why would you ever use pillars?
Six of these, six lycanthropes, and a dark mark make for the most brutal rush deck ever.
6 Supernova and 6 Werewolf and a Entropy mark and even the Precurser Nova and Lycanthrope is just as fast. Still not as fast as Immolate|Photon on top. Wait thats the 4 turn winning deck I already use against the AI3.
But what happens if you have, for example 
mark and you play stone rush? do you get 3 
and a tower? And can you have 6 Entropic rush and 6 Water rush in your deck at the same time? That's the only critisism I have. As that can be abused with novas.
Yes your example of 3
and a
tower is correct.
Yes you can have 6 of each if you really want 12 pillars matching you mark and a temporary 18 Entropy and 18 Water Quanta. Note that as each rush burns random quanta you could lose the quanta you rushed from a previous card. In this example there is also a spenditure of 24 random quanta.
