Lathril, Blade of the Elves is a Golgari () elf combo deck. The primary combo involves an elf that can tap for at least 5 mana (Priest of Titania or Elvish Archdruid) and Staff of Domination. Ezuri, Renegade Leader and Tyvar, the Pummeler are mana sinks, so with infinite mana, infinite untaps, and infinite cards, expect to finish the game on the spot.

You can always win through combat damage with Craterhoof Behemoth or Allosaurus Shepherd, a win condition that's near and dear to Modern and Legacy players. Throne of the God-Pharaoh serves as yet another win condition along with Lathril itself.

Part of this deck’s power comes from its versatility and I hint at a few more alternatives below.
Upgrades

These upgrades add more tutors and make the deck more explosive overall. Cards like Galadhrim Ambush can raise the number of elves you control while Finale of Devastation is another wincon. Seedborn Muse is an upgrade you feel every turn.

    Card advantage: Elven Chorus or Beast Whisperer.
    Threats: Galadhrim Ambush, Finale of Devastation.
    Tutors: Vampiric Tutor, Worldly Tutor.
    More win conditions: Bolas's Citadel, Elderfang Venom
    Lands: Bayou, Boseiju, Who Shelters All, Cavern of Souls, Gaea's Cradle.