Granted, this path and the ones involving tokens lean a lot more in the combo direction than the mana acceleration direction, but its definitely worth noting Carnival of Souls capability of being useful outside unreliable 3-4 card loops in these strategies, as it gets a bad rap Im not convinced it fully deserves when reading about its capabilities elsewhere
Thats a very low cost for an extra land - and means that if you cast it on your second turn, youll have four mana on your third turn
But theres also a lot of great ideas here, as in Winding Way, Geist-Fueled Scarecrow, The Irencrag, and Eidolon of Philosophy
Kenrith, The Returned King This deck gives access to all colors, which is rare for Group Hug
What I really enjoy here is the lifelink and deathtouch, like the Vault of the Archangel activation