In my monored team against most green tanks, my level 25 mana troop goes to my Wilbur+18 (i need him to fire his skills in 9 tiles to protect the entire team due to the shared damage), level 11 mana troop to my Mitsuko+20 (the last node of her talent is +4% mana bonus, so she fires also in 9 tiles), level 5 mana bonus to Boldtusk+18 with MCB (also fires in 9 tiles and will heal my team for whatever shared damage they get as well as buffs Mitsuko’s attack). My Falcon+18 is supported by a level 5 crit troop while unemblemed Azlar or Gravemaker+19 is supported by a level 20 crit troop. In 9 tiles, heroes are fired from BT, then Wilbur and then Mitsuko to protect the team from blue offensive skills by dumping tiles at them and forcing them to fill their mana for them to fire their skills (news flash: Vela is nerfed so much that she doesnt die on Mitsuko’s reflect as you need her to fire her skills 2 to 3 times before dying, but most blue dies though, except Cobalt who bypasses), and while looking for the next red match for me to fill mana of Falcon and Azlar, hopefully while under Wilbur’s shared damage to maximize damage output.
Ranger talent where the +2% mana bonus can be opted early and you may need this to support an average hero by a level 17 mana troop instead of level 23. Example is Neith or Tiburtus. Another is when you have a limited number of mana troops (like the case I have mentioned above as I only have 3 of them but instead of Mitsuko, you have another class that only give +2% mana bonus in the talent tree and level 17 mana troop is a bit easier to do).