Looking closer at my numbers, I'll try out this manabase, as it seems like the most reasonable combination of speed, consistency and utility, given the numbers:
4 Ancient Tomb
4 Cavern of Souls
4 Caves of Koilos
4 Eldrazi Temple
2 Eye of Ugin
2 City of Traitors
2 Urborg, Tomb of Yawgmoth
2 Karakas
4 Lotus Petal
Now all what I have to do is building a sideboard that does its job vs Shardless while being good vs other decks as well. From my experience, Matter Reshaper, Mishra's Factory and All is Dust are all cards that performed well vs Shardless. The best way to win is to overrun them before they can get their CA engine going and grow their Goyfs beyond our reach. Reshaper and Factory aren't really options for the BW build, but I could see 2-3 All is Dust doing well. I'm unsure if I rather want to run RiP or Leyline as GY hate of choice. How Toxic Deluge performs vs Shardless isn't entirely clear, either.
So far, my new board looks like this:
1 Karakas
3-4 RiP/Leyline
2-3 All is Dust (heavily leaning towards 3 copies since that worked best for me)
1 Toxic Deluge
which leaves 6-8 SB slots up in the air for various stuff.
- Maybe SB Thorns for Combo/spell-heavy decks? Has anybody experience if Sphere of Resistance slows Shardless down enough (e.g. Making Shardless Agent a 5 mana deal instead of 3 mana one)?
- Warping Wail #3?
- Some anti-Blood Moon tech would be nice that has other applications as well. Could be either artifact/enchantment removal or, as I mentioned previously, colorless mana artifacts with utility. Or maybe just straight up ramp artifacts (
Worn Powerstone,
Thran Dynamo,
Grim Monolith) + SB Ulamog? Or GW Talismans with World Breaker?
- I don't know how valid Containment Priest is anymore with multiple Toxic Deluges in the deck.