You have way overnerfed this card by adding the 7-N/8-N attack feature. If the opposing player has any shield up, you effectively get less and less attack every turn with no benefit to yourself.
E.g., Opponent plays Shield buckler
Turn 1: Apollo = attack: (7 - 0 photons previous turn) - 1 blocked by shield buckler = 6 damage
Turn 2: Apollo = attack (7 - 0 photons previous turn) - 1 blocked = 6 damage
photon = attack 1 - 1 blocked = 0 damage
Turn 3: Apollo = attack (7 - 1 photon previous turn) - 1 blocked = 5 damage
photon = attack 1 - 1 blocked = 0 damage
photon = attack 1 - 1 blocked = 0 damage
Turn 3: Apollo = attack (7 - 2 photons previous turn) - 1 blocked = 4 damage
photon = attack 1 - 1 blocked = 0 damage
photon = attack 1 - 1 blocked = 0 damage
photon = attack 1 - 1 blocked = 0 damage
This card becomes less and less valuable each turn....
This card is sure to be played with Hope
Turn 1: Apollo = attack: (7 - 0 photons previous turn) - 1 blocked by shield buckler = 6 damage
Hope = 0
Turn 2: Apollo = attack (7 - 0 photons previous turn) - 1 blocked = 6 damage
photon = attack 1 - 1 blocked = 0 damage
Hope = 1
Turn 3: Apollo = attack (7 - 1 photon previous turn) - 1 blocked = 5 damage
photon = attack 1 - 1 blocked = 0 damage
photon = attack 1 - 1 blocked = 0 damage
Hope = 2
Turn 3: Apollo = attack (7 - 2 photons previous turn) - 1 blocked = 4 damage
photon = attack 1 - 1 blocked = 0 damage
photon = attack 1 - 1 blocked = 0 damage
photon = attack 1 - 1 blocked = 0 damage
Hope =3
Damage + Shield is constant
Damage + Shield + Quanta is rising
Eventually you would want to use some creature control on Apollo but in the short term the swarm is more beneficial IMHO