Never pull on a UR banner unless you have (or 36,000 Gems saved). UR drops are random, but the pity system gives you 80 shards at 200 pulls. You need 150 shards total. If you get lucky with a drop (40-60 shards), you supplement the rest via the pity.

Do not chase every banner. Here is your optimal strategy using the for the next six months.

Keep in mind that the following is speculative and based on past patterns:

Some of the banners are: