Quantity Control (Duplicate anything) [Twin Universe, Mind Gate, Fractal]
Location Control (Move Around on the board, Switch with cards in hand) [Animate Weapon]
Use opponent's strength against them. I think Darkness should be very symbiotic. (Strong opponent = Strong Darkness, Weak opponent = Weak darkness) [Pest, Steal]
Feed of deaths the more the better [Graveyard, Vulture, Bonewall, Altar(card idea)]
Stable technique. (play pillers, play creatures, win) [Lots of Earth creatures, Heavy Armor]
Chaos but channeled to favor the user [Mutation, Chaos Seed/Power]
Short term gain at the expense of the long term [Immolation, Fragile creatures, Even doom clocked creatures]
Stable technique. (play pillers, play creatures, win) [Momentum, Charger]
Feeds of life the more the better both creatures and you [Empathetic Bond, Heal, Druidic Staff]
Stable technique. (play pillers, play creatures, win) [Golden Dragon, Morning Star, Blessing, Archangel]
Card Control (Draw, Discard, Rewind, Search) [Hourglass, Eternity]
Passive resistance and redoubled force (creatures that don't die get stronger but not on their own) [Freeze ...]