I have a friendly formated list of this AND the cards porportion on FGs decks, excluding towers and pendulum, because, of course, the chance of getting these is irrelevant.
I was thinking about post it, but of course this is not the proper forum.
Anyway, if you just want a list of cards that are not used, here it is:
Dagger / Dirk
Short Sword / Long Sword
Hammer / Gavel
Shard of Divinity
Shard of Gratitude
Shard of Readiness
Short Bow / Longbow
Antimatter / Improved Antimatter
Pandemonium
Schrödinger's cat
Skull Shield / Skull Buckler
Skeleton / Elite Skeleton
Aflatoxin
Mummy / Elite Mummy
Soul Catcher
Grey Nymph / Death Nymph
Graviton Mercenary / Graviton Guard
Basilisk Blood
Iridium Warden / Vanadium Warden
Auburn Nymph / Earth Nymph
Thorn Carapace / Spine Carapace
Mitosis
Immolation / Cremation
Red Nymph / Fire Nymph
Steam Machine
Nymph Queen / Water Nymph
Holy Light / Holy Flash
Luciferin / Luciferase
Hope
Sanctuary
White Nymph / Light Nymph
Dragonfly / Damselfly
Wyrm / Elite Wyrm
Azure Dragon / Sky Dragon
Fog Shield / Improved Fog
Thunderstorm / Lightning Storm
Firefly / Elite Firefly
Wings
Sky Blitz
Blue Nymph / Air Nymph
Sundial
Scarab / Elite Scarab
Dune Scorpion
Ghost of the Past
Golden Nymph
Black Dragon / Obsidian Dragon
Gargoyle
Black Nymph / Dark Nymph
Spark / Ball Lightning
Mindgate
Silence
Turquoise Nymph / Aether Nymph
Like said, this list does not consider pillars and pendulum. Also, a little piece of info: do you know which cards are used by most FGs? Explosion and Unstoppable, 7 FGs each.
Edit: just checked, Chromatophore list is perfect.