I wonder if anyone has tried the old gate to hell with the Adramlech warlock?
Seems that a fire attack against every non flying enemy creature in the game, plus wildfire imps, and the new synergies from Forged in Fire could be pretty fantastic.
It's still a huge cost - 24 mana - but it seems more viable now, especially against a swarm deck. (Of course to make it really good vs the druid, adding its attack to plant conjurations would be awesome and feel entirely thematic, but perhaps make warlock too strong against the druid.)
On an aside, can a demon summoned from a Pentagram also appear at the gate to hell?