I have a Wrexial edh deck that's cthulhu/tentacle themed. I'll go find it.
Tentacles
Guard Gomazoa
Volition Reins
Shadow of Doubt
Body Double
Clutch of the Undercity
Cosmic Horror
Duplicant
Guiltfeeder
Mystic Speculation
Mutilate
Hypnox
Draining Whelk
Ichor Slick
Ghastly Demise
Isleback Spawn
Traumatize
Laquatus's Champion
Lorthos, the Tidemaker
Words of Waste
Deep-Sea Kraken
Suffer the Past
Twisted Justice
Brink of Disaster
Gomazoa
Mindleech Mass
Scattering Stroke
Dreamstone Hedron
Urborg Mindsucker
Moonlight Bargain
Denizen of the Deep
Tendrils of Corruption
Induce Despair
Wrexial, the Risen Deep
Water
Confiscate
Rushing River
Countersquall
Capsize
Spreading Seas
Mind Spring
Quest for Ula's Temple
Dream Leash
River's Grasp
Treasure Hunt
Sea Gate Oracle
Dream Fracture
Inundate
Into the Roil
Recursion
Mnemonic Wall
Removal
Innocent Blood
Decree of Pain
Draw
Jalum Tome
Sign in Blood
Recurring Insight
Rhystic Srudy
Mask of Riddles
Crystal Ball
Theft
Knowledge Explotation
Memory Plunder
Mana
Basalt Monolith
Talisman of Dominance
Darksteel Ingot
Sol Ring
Dimir Signet
Expedition Map
Armillary Sphere
Worn Powerstone
Mistvein Borderpost
Other
Diabolic Tutor
Bottomless Pit
Evacuation
Induce Paranoia
Fatal Lore