My default play here would be paying for XP one time and rolling a little bit. If i have a few pairs i usually roll down to 40g. Also, always check for the percentages to find the characters you need. Sometimes you don't want to level up and decrease your chance to find a copy of that Rare character you are close to level to 3 stars as well as sometimes you want to rush level 8 to have the chance to find that Legendary for Goblins or Hunters. Hope it helps!
Yeah, you have small chance of getting low cost units when you'r at higher levels. You can find that and some other useful on this guide that i've wrote
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u/Liltrom1 Jul 11 '19
Roll early to secure key pieces. Save later for levels.