Expanded Themes

Atlach-Nacha has Deathtouch, Reach and Indestructible.
Whenever you draw a instant or sorcery, put a web counter on Atlach-Nacha. For each web counter that would be added to Atlach-Nacha, tap all creatures opponents control, they don’t untap during their controller's untap step.
When there are 20 or more web counters on Atlach-Nacha, destroy all permanents, they can’t be regenerated.

Chaugnar Faugn has Indestructible and Lifelink.
Emerge – Pay half your life, rounded down. (You may cast this spell by sacrificing a creature and paying the emerge cost reduced by that creature's converted mana cost.)
Whenever another creature dies, you may put X +1/+1 counters on Chaugnar Faugn, the Feeder, where X is that creature's power.
Whenever a player loses life, that player loses twice that much life and you gain that much life.

At the beginning of your upkeep, if Nyarlathotep is in the graveyard, in exile, or on the battlefield, you may have Nyarlathotep become a copy of any creature on the battlefield, except its name is still Nyarlathotep, it's legendary in addition to its other types, and it gains "You may cast this spell from your graveyard or from exile." and this ability.
During each of target players upkeep, that player may pay , where X is the number of chaos counters on Nyarlathotep, the Crawling Chaos. If they do, put a chaos counter on Nyarlathotep, then destroy each other permanent with converted mana cost equal to the number of chaos counters on Nyarlathotep. Otherwise, that player sacrifices each permanent they control.

Shub-Niggurath enters the battlefield with X +1/+1 counters.
: For each +1/+1 counter on Shub-Niggurath, create a 1/1 colorless Eldrazi Scion creature token. It has "Sacrifice this creature: Add ."
Sacrifice 5 creatures: Search your library for a colorless Eldrazi creature and put it onto the battlefield tapped.