Opalia24, thanks. If only i knew that during the 3rd Gambit...
But i agree with the nip101's corrections - i use silver keysgo get more SR girl cards for the "Get 1 SR" Daily Mission 9they are too few to do "get 3 SR" but if you have levelled all/most of your SR cards to lvl 100 and don't need SR wildcards that much, and are in a desperate need of Ex Wildcards - you can still use them for the "3 SR" daily Mission.
And yes, 230k Trophies for the E-gacha Ticket is nonsence for an f2p player, sice even a zealous maniac like me can hardly get even 30k by the end of Event. Though, i should try your advice about the 2nd Stage - never thought about that before. But well, i don't have any E-gacha Tickeths now, so... i'll try the E-gacha advice next time.
I can also suggest that one might want to use Radars before they reach the Bonus Stage, since Trophy Time and Boss Encounters are quite frequent there even without the Radars - unlike the normal stages.
I also can suggest you to check your friends' case history, and try to add to your friend list those people, who open alot of silver and gold cases, and, first of all, retrieve rewards from your gold, and then - silver cases, that you have found and your friends have opened - previously enabling the "get 1 SR girl" daily mission - doing so you will get an extra SR Wildcard if you get SR Girl Card from one of those cases. After you get one - save the rest of your silver and gold cases until the next day, or go retrieve that SR Wildacard and enable "Get 3 SR Girls" Daily Mission if you have tons of opened Silver Cases - as those cases seems to not have expiration date - at least, until the Event will end - and only then, when you have no Silver and Gold Cases - go and open some Gold and Silver cases of your friends - if you have teh required Keys - since Keys do NOT expire when the event will end, and you can use them on the next Gambit. Though, consider opening Gold and Silver cases which are about to expire in a few minutes (i'd say - less than 15 or 10 minutes) - especially if they belong to the person that opens your Silver and Gold cases alot, or to a low-level player to help them (you should know such players if you ever look into your Case History and the back end of your Friend List). You can also go to teh Case History and search for those who hunt Pink Cases (opens most of them from your friends or yourself, and don't open other types of cases) and avoid having them, or people who have them on their friend lists if you want to get the most loot from Gambit Cases but that is another story...