Cheers Davek. Just my pov, I'm not suddenly an authority :-)

I've felt exactly the same about Blood Moon. From my PoV it's a 4 of (instead of 1, or 2) because of (1) higher chances of getting it ASAP, when it counts, and (2) having redundancy. Even if just the moon-by-proxy, i.e. playing a mountain makes your opponent play more slowly by making sub-par, you already gained something. It's just really strong against a couple of strong decks atm: Storm (t1), RUG Delver, Depths. Against the other decks, just side it out.

Wurmcoil Engine - I've been going back and forth on him, but for now he's a great lightning rod that I could potentially hardcast. I agree with you on that point.

I haven't felt the need for 2 Tormod's Crypt. Honestly, SnT I feel is a lost cause, and if you're winning it's not because of 2 Crypt - it's because your opponent doesn't have counters. vs SnT, I'd rather go for a disruption plan and a Wurmcoil beats, or karn shenanigans, than spend resources on a very fragile 2 card combo. SnT is just a terrible matchup.

I haven't really found the need to ever get a Needle/Spyglass, is why. Even if in theory they have their applications.

The deck runs enough artifacts for the Opals, never had the trouble. They're like Petals that don't go away, and 2 feels like the right number, they're great.

I'm actually thinking about adding more blasts (sideboard) and maybe switching out Wurmcoil or Canonist for Ichor Wellspring to try it out. Astrolabe has been great as a card draw engine and mana fixer, so I'm interested to see if there's any improvement there.

As for LED, I never felt that they were wrong. While I've yet to get into the situation that it was a (bad) topdeck for me, the black lotus has been amazing against fast decks and e.g. RUG delver to keep extra mana open for counters / paying off daze/pierce, and then have 3 for activation. I wouldn't use them for an all-in combo unless you're safe. If anything, you're threatening the combo ridiculously early, and can just keep playing freely with the "I win button" on the board, which otherwise would have you keep the significant amount of 3 mana open.