Secure a kill early in the fight, the permanent regen from Reaper's Scythe makes you much harder to bring down.

Save Reaper's Scythe for low HP cores, it scales with missing health and adds respawn time.

Ghost Shroud makes you immune to physical damage and amplifies healing, so pop it when carries focus you.

Heartstopper Aura drains max health from nearby enemies, so drag fights out and they wither.

Death Pulse reveals invisible enemies, so cast it toward a suspected Riki or Bounty Hunter.

Stay alive to the end of the fight, Reaper's Scythe on a low target late wins the whole teamfight.