Board Thread:Event Help/@comment-38204064-20190117180652/@comment-24189530-20190121105417

the quests give you dragon stones on first clear. you also get 1 extra stone for completing all of the quests of a stage on a specific difficulty (so each stage gets you a total of 3 extra stones on top of all the stones from each quest). If you need stones for a summon and you haven;t done all the quests yet, they are a good source of stones.

Also, as valas stated above, you do have a good amount of units for a fusion team. I might suggest saving up dragon stones (try to get to 150) because the next big event after the current buu event will be the dragon ball super broly movie event. it will have a dual dokkanfest with one summon banner being broly and the other being super saiyan gogeta (he has a different name from the super gogetas you currently own so he could be put on the team alongside one of them and have near-perfect link skill activation.) The dokkanfest will have a 3+1 summon, where after 3 multi summons you get 1 free (hence why you should try to save up 150 stones).

Otherwise if you have 200 dragon stones i would instead suggest summoning on the current new year's banner as 200 stones guarantees an Lr (only 10 available for the summon but an Lr is an Lr).