Thanks! Yeah, the speed problem...is a problem!!! I considered to remove the WB bridges exchanging them with 2 W and 2 B artifact lands, but I need them for the multi-colored mana and, especially, for kenku.
In any case, I'll adjust the deck after some tests.
Cast down and edict would be also a good idea...probably would be better include them in the side. The fact is that I'm not really scared about creatures (I should have multiple indistructible defensors) ...the big deal will be manage control and burn, for this reason I prefer counters instead removal...but, also this observation, it'd be a valid option. Thanks for advices.