Knull, God of the Symbiotes

Indestructible, Vigilance, Haste
Symbiotic Dominion: When Knull or another non-token Symbiote enters the battlefield under your control, if it has a unique color among Symbiotes you control, create a colorless Symbiote Parasite token attached to target creature an opponent controls.
{w}{u}{b}{r}{g}, Sacrifice five creatures you control but don't own: Create The True Necrosword, an Equipment token with "Equipped creature gets +5/+5, trample, and 'If this creature deals exactly 10 damage to an opponent,