reposting

>>536341074
have: 240 rolls
have: 10+42+42=94 days (each banner is 21 days)
want: 4S ranks
need: 600 rolls (to guarantee)

result. pic related
>expected to have: 415 rolls
my calculations are on the conservative side. but you would still need to get at least statistically lucky (each won 50/50 is worth around 75 rolls. out of 4 you would need to win 2. W-engine is 75/25, so you're more likely than not to have it)

5$ pass= 2700 poly over 30 days = 17 rolls
you can get max 3 in that time period (94 days) for 51 rolls and 15$ if you buy the first one in the next 4 days
this would improve your odds, but it still won't guarantee them

>>536341074
have: 240 rolls
have: 10+42+42=94 days (each banner is 21 days)
want: 4S ranks
need: 600 rolls (to guarantee)

result. pic related
>expected to have: 415 rolls
my calculations are on the conservative side. but you would still need to get at least statistically lucky (each won 50/50 is worth around 75 rolls. out of 4 you would need to win 2. W-engine is 75/25, so you're more likely than not to have it)

5$ pass= 2700 poly over 30 days = 17 rolls
you can get max 3 in that time period (94 days) for 51 rolls and 15$ if you buy the first one in the next 4 days
this would improve your odds, but it still won't guarantee them