March 18, 2018
Innervate's cooldown recharges 25% faster per ally affected by Regrowth.
Rejuvenation if the enemy team has a number of ways to poke your health pool down
Entangling Roots spawns a Treant that deals 58 damage per second and lasts 10 seconds. Repeatable Quest: Hitting enemy Heroes with Entangling Roots permanently increases the Treant's damage per second by 7.
Strangling Vines against Uther/Alex or double support comps
Activate to remove all Stuns, Roots, and Slows from allies affected by Regrowth.
Wild Growth if your team doesn't need a cleanse...always err on the side of caution and consider uncommon ultimate abilities (e.g Apocalypse or Judgement)
Heal nearby allied Heroes for 80 Health per second for 8 seconds. Allies affected by Regrowth within Tranquility's area gain 10 Armor.
Twilight Dream if your comp requires hard CC or the enemy has a large number of melee heroes who will be hit by Twilight Dream.
Malfurion gains 6% Movement Speed for each active Regrowth.
Revitalize is fine if you are safe in team fights and don't require the additional move speed
Increase Moonfire's heal by 15% per ally affected by Regrowth.
Each enemy Hero hit by Moonfire reduces the cooldown of Tranquility by 3 seconds. Increase Tranquility's healing by 10% per ally affected by Regrowth.
Lunar Shower if you took Twilight Dream at 10
Balance Patch - 2/21/18