A while ago, someone posted a life/death combo card (something to do with locusts, I think). I, for one liked this idea, and here are my ideas for the rest of the elements. CAPITAL element means the element that it casts with, and the ability is paid for with that elements opposite, eg Torch is cast with LIGHT quanta, but Wink Out costs darkness quanta.
Costs are undecided. Brackets () means upgraded, italics means notes
LIGHT
Torch (Lamp) - Permanent
Wink Out - all creatures are in statis for one turn. Because they can't see. Destroy this card.
DARKNESS
Veil (Covering) - Permanent
Blinding Flash - all creatures are in statis for one turn. Because they can't see. Destroy this card.
LIFE
Agar Plate (Bioculture) - Permanent
Culture - start a counter at 3(2). When the counter reaches zero, generate 3 Viruses.
DEATH
Dirty Bomb (Bioweapon) - Permanent
Strike - start a counter at 3(2). When the counter reaches zero, generate 3 Viruses.
FIRE
Blaze (Conflagration) - Permanent
Consume - All non-fire creatures lose 1/1, water loses 2/2
WATER
Floodgates (Dam) - Permanent
Unleash - All non-water creatures lose 1/1, fire loses 2/2
GRAVITY
Red Giant (Red Supergiant) - Permanent
Implosion would be nova/supernova, but they're taken - Field is wiped. All creatures are destroyed, twice to stop boneyards activating
ENTROPY
Uncertainty Principle (Schrodinger's box Is that spelled right?) - Permanent
Observe - A random creature is either killed, or copied to your side.
TIME
Field of decay (Field of degenerance) - Permanent
Decay - destroy target permanent in 3 (2) turns
AETHER
Warp (Curvature) - Permanent
Distort - Destroy target pemanent in 3(2) turns
EARTH
Cliff (Crag) - Permanent
Topple blown over - two random creatures are killed
AIR
Tornado (Hurricane) - Permanent
Hurl boulders sucked into vortex, thrown out - Two random creatures are killed