I disagree. It is even more disgusting now. Since I can cast it multiple times. I only need 3 dice for an almost reasonable chance for base purple to go off w/ a level 4 this is not including a hierotitan or other bonuses that are easily available in end times. It also makes powerstone autoinclude in all lists for when you roll low.
Average magic phase 14 dice.
1st attempt purple sun 1 dice wasted.
2nd attempt purple sun 2 dice+stone successful cast.
3rd attempt purple sun 3 dice less than 50%
4th attempt purple sun 4 dice successful cast.
This means now ogres/dwarf/lizardmen will have to stop 2 or more purple suns a phase. ROFL! Tactics bro!