Quote Originally Posted by Firefight View Post
How many times, limited activation will put you in that position, and in that scenario, that Gemnstone is actually a Bayou or Badlands, non blue, so cantripping is out of the equation, the line of play will completely change based on the fact that is your currently only land in play.

I'm not defending Gemnstone Mine , I just want to be able to understand what makes it so awful :)

Also, what would be a real 15 SB card in this new (old) Meta ?
Maybe something like this:
3 Abrupt Decay
1 Sensei's Divining Top
1 Krosan Grip
2 Massacre
2 Chain of Vapor
2 Xantid Swarm
2 Flusterstorm
1 Carpet of Flowers
1 Ad Nauseam / Empty the Warrens (depending on MD)

You have 3 Decays, Top, Grip and possibly Swarm (+ AdN/EtW) for Miracles. Needle is an alternative to Top if you don't play MD Tops.
You have up to 7 removal slots to swap out for discard with Chain, Decay and Massacre. Decays are mainly for Chalice/CB, Massacres for UWR, Deathblade etc. and Chain for random hate.
Swarm + Flusterstorm help in the SnT/Griselbrand matchups. If they play Leyline you also board 1-2 Chains. Flusterstorm also fights Storm and discard decks.
Carpet is one of the better SB cards versus RUG Delver if it comes back, and 2 might be good if it does. It's also fine versus UWR Patriot.