Too expensive. Lower that cost by 10 quanta and make it a permanent.
Antimatter instantly makes the large creature detrimental to the opponent. This takes a while. Long enough that you'll probably be dead before the attack hits zero.
Done
Not sure why this is and not
Me, too. Both the thematic (heat) and the mechanic (attack manipulation) screams than
Fire is more about killing, Light is more about heal.
Fire Bolt makes a creature dies, Heat Wave doesn't kills a creature and even instead makes it heal.
Fire is more intense and its destructive power is seen 1 turn, Light elemental Heat Wave consumes lots
of time but still, it is not really destructive.
Heat comes from both Fire and Light (Sun)