Blue Team
This is a tactic team wherein "blue team" simply describes as to Drain the enemy's Mana Pool. Different heroes like Outworld Devourer, Lion, Anti-Mage, Keeper of the Light and 1 any hero that are capable in using Diffusal Blades.
Outworld Devourer abilities like Arcane Orb will steal your mana and his Sanity's Eclipse will remove you in mini-map if your mana pool is lower than Outworld Devourer does.
Lion ability of Mana Drain is obviously will drain your mana
Anti-Mage first ability of Mana Break will burn the opponents mana on each attack.
Keeper of the Light second skill Mana Leak causing them to lose a mana when they move and it will stunned if doesnt have mana anymore.
Diffusal Blades are capable in losing mana on every attack like Anti-Mage's first skill.