Attacking four times at only half the cost of the creature is OP.
That is equivalent to summoning four creatures for 1/8 the price of all of them combined.

6 time quanta for 60 damage.
By any chance, is this connected to that card that costs 5 darkness quanta to deal 50 damage?
If so, I suggest nerfing both.
If not, I suggest nerfing both.