I aimed for 100% of the cards to be on lovecraft flavor.
Use monstermorphosis, shapeshift, den of evil, towers, harbinger text, mixes and vermis to summon the big hitters under curve. Giving ether core to a low power voidwalker also works. Or giving your avatar the ether core if you can place him at The Void site. Its preferable to transform frogs into big hitters, frogs come from either croaking swamp or tadpole pool.
Most minions are either monster or voidwalkers, sometimes both, in order to tech with monstermorphosis, howl from beyond and black mass.
About the collection: use geyser to kill root spiders, snowball to close the game (remember, you can give silver bullet to any unit and cast the magic from it).
Remember to play omphalos to your portals if you can, in order to get the -1 mana discount from portals.
You can switch harbinger for seer while staying on lovecraft theme.
Edits:
23/09/26: The frog sites and monstermorphosis were removed to increase the deck consistency (which isnt much anyways), add them back if you want to double down on the big hitters tech. Remember monstermorphosis can be used to disable an enemy minion but transforming it in something else is optional.
23/09/26: Since I'm depending on techs to have an edge I believe the Seer makes more sense. Am testing.