Best tactic with leveling

  1. Rainbow color leveling, so 5 heroes each color at the same times, red to red, etc.
  2. 2-3 rainbows *3 heroes. (if nothing *3 hero in that color, start leveling *4 or *2 hero)
  3. after 2-3 rainbow *3 heroes maxed, then start leveling *4 heroes.

Consider best *3 heroes by color:
Red: Rudolph, Squire Wabbit, Namahage, Hawkmoon, Nashgar, Azar
Blue: Gato, Valen, Ulmer, Gunnar
Green: Muggy, Belith, Brienne, Berden, Mnesseus, Hisan
Yellow: Bane, Gan Ju, Melia, Kailani
Purple: Balthazar, Tyrum, Chochin, Gill-Ra

Here is starter pack New Player Guide: