Okay, I understand what you're saying, but let's first look at Dimensional shield. It only protects you for 3 turns, (poison, spells, other instant damage, deflag, BE, so you're still not safe!). Even though all these counters (Discord not (only affects if causes damage) affecting, BH, come on, 3 quanta is nothing) it is possible to Chain against MANY decks, which doesnt use heavy PC or momentum (these are restricted to only certain elements). And Dimensional shield is 6/5
. So assuming ideal case you've stalled the opponent for 18 turns!!!
Now compare this with Electromagnetic Field. 5 turns of invincibility! Chance for 30! turns of chaining and the opponent can't do ANYTHING, but watch and deck out. True, that a well timed silence can stop you, but silence is only
. True, devourers can screw you up, but it's only 1 out of 12 elements, and honestly,
stall against fractaling devourers.... Well devourers will suck all your quanta before you ever get 8/6 to play your card in the first place. BH sucks 3 quanta and (after chaining your shields and collecting high amounts of quanta) it won't affect you greatly. And Discord doesn't scramble, unless it does some damage... So it won't mess you up.
This leaves us with 30 turns (you didn't draw during these turns!!) giving you a chance to deck your opponent out with a 31 card deck!! In total you can hold off your opponent from doing damage for 48 turns!!!! Even against 60 card deck your opponent will only have (60-48-7or8) cards left. So you leave your opponent with 4-5 turns to do anything. And honestly, how many 60 card decks are you facing ?
I'm not against your idea, I like it a lot, but consider making it targatable, not immaterial. Because in this way, with no way to counter it and with the chance to chain + shields, it is a tiny bit OP.