The good news is: they drop like candy during Elite Guard, it's an ideal event to stock up on them. Using only raw pero and raw pudding since maintenance (I'm saving up the more durable ones for either phase 2 and/or Gambit phase 2), EGs gave me about 50 levels worth of SR wildcards already.

- - - Updated - - -

why should i lv up the slayers? I'm a newbie here and i thought the effect of the slayers is the same even it's lv 1 or 100. Am i wrong?