It costs 3

for 14 att after turn 6. You need 6

to cast 2, meaning 28 att since turn 6.
Turn 1, 2, 3, 4, 5 - 0 damage
Turn 6 - 28 damage
Turn 7 - 56 damage
With 1 GoTp (same 6

quanta)
Turn 1 - 7
Turn 2 - 14
Turn 3 - 21
Turn 4 - 28
Turn 5 - 35
Turn 6 - 42
Turn 7 - 49
The damage is indeed balanced in my opinion, I like it.
I would also make it 3|2 cost, I think you put the wrong costs ^^