If you are going for blade then its featured crystals you should be going for. Featured crystals have increased odds for the specific champ. If you do basic then blade has the same chance as spidergwen or iron patriot
The Chance for getting a featured 5* is estimated to be around 20% to 25%. The chance off pulling a specific Champ out of the basic pool is below 3% so if you want a specific champ you should go for the featured crystal
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Gets added to basic pool at beginning of February, featured crystal is scheduled for Feb 22nd