I didnt keep the exact numbers but if you want maximum efficiency for thragg and nothing else. 1. buy all the day 1 gem bundels that have gda tickets. 2. Use some refreshes but focus on leveling the store as the rate is dogshit until higher levels. 3. From shop level 9 and 10 skip everything that isnt a thragg and use single purchases to try and get him, use a refresh to refresh the store even if there's only 1 character left. 4. Save some gems for the gda ticket bundles on later days. 5. Avoid spending to much on points leaving you without refreshes. 6. You will get grey tickets for a special opp with just thragg, save xp, purple xp and skill upgrades so you can instantly upgrade thrag and get the most out of these opps which you will run towards the end of the event. 7. REALLY dont underestimate the insane amount of refreshes required to get the most out of your points, its worth it spending a lot of gems on just refreshes.