Circular Saw

2 weapons: +1 Melee Damage; +1% Life Steal
3 weapons: +2 Melee Damage; +2% Life Steal
4 weapons: +3 Melee Damage; +3% Life Steal
5 weapons: +4 Melee Damage; +4% Life Steal
6 or more: +5 Melee Damage; +5% Life Steal

MeleeBlade MedicalTiers II–IV

Unlock: Available from the start
Starting weapon for: King

Community builds that use it

DoctorStay on Medical weapons, the only ones that keep the attack-speed bonus: Scissors upgrading to Circular Saw with Melee Damage, or Medical Gun with Sharp Bullet, Bandana or Ricochet for area clear. Healing is built in, so items that cost HP become affordable.
MasochistGetting hit adds % Damage, so tank hits with Armor, Max HP and HP Regeneration; Spiky Shield (unlocked by winning with Masochist) is the main recommendation, with Scissors, Ghost Axe or Medical Gun as alternatives. Blood Donation or Bloody Hand trigger the passive every second.

Stats by tier

Tier II Uncommon
Damage
10 (+100% Melee Damage)
Cooldown
0.72s
Crit
x2 (5% chance)
Range
175
Tier III Rare
Damage
15 (+100% Melee Damage)
Cooldown
0.67s
Crit
x2 (10% chance)
Range
175
Tier IV Legendary
Damage
25 (+100% Melee Damage)
Cooldown
0.62s
Crit
x2 (20% chance)
Range
175

Damage in brackets is added from your stats before %Damage multiplies the total; see the damage formula or the calculator.

DPS at tier IV

48.4 DPS with no stats, 87.1 at 20 Melee Damage and 145.2 at 50 (single target, every projectile hits, crits averaged): #19 of 58 weapons that scale with Melee Damage. Full ranking or your own stats.