Thanks a lot! 
What's...EM? >.<
Also, about how many pillars should I have in a deck? I have around 12 right now...and will be adding more with my fire duo deck.
EDIT: What are the advantages/disadvantages of a rainbow vs a mono, duo, or triple deck?
1. EM = Elemental Mastery, this means you have won the match with full health (HP). This will give you more score and Electrum.
2. 12 pillars is good in a 30 card deck. I'd say around 30% of your deck should consist of pillars/pendulums. Maybe a bit more when they are unupgraded. Alot of rainbow/rush decks use cards like immolation and nova (like the deck I just posted). Those two cards generate alot of quantum wich means you need less towers.
3. The advantage of a rainbow deck is that it's very versatile, you can theoretically use any card from any Element. This way it can have creature cards, permanents, CC (creature kill cards), PC (permanent destroy cards) and healing/defense. I don't wanna make this more complicated then it is but just remember rainbow decks are generally very versatile with good defense and offense.
Mono decks can rush very well (meaning they are very fast) and they are easier to set up, since it only uses one type of quanta. The way a mono deck works depends on what element it is. Mono Fire means it's probably a rushing deck, while mono aether is more likely to have a slow controlling deck.
There are loads of decks, and over time you will learn how to use them and wich is best in what circumstance. There is no best deck or best element, everything can be countered. This is imo what makes Elements fun.
