They would both trigger, but the first one (resolving second) would do nothing.
Also, it would probably be best if you reposted your EDH decks here. In general, they lack recursion and reusable effects. Also, look for creatures to do what your instants/sorceries achieve. Shriekmaw over Terror and such.
The black one could use more fat creatures. Remember, everyone has 40 life and it's a multiplayer format. Small creatures don't cut it unless they're there for utility and the occasional attack.
Yeah...it would have before the errata, but the way it's now, it doesn't anymore.
Weird errata.
Sure, why not?