I like using bottom tree sentinel with doom fangs for massacres. Got 3 in one match that way.
Arcstrider was a must-have for my massacres. I got 8 of them with Way of the Warrior, and another 2 with Recluse and Delirium. I almost Locksmiths more frustrating, but found that Liar’s Handshake and one-two punch made it work.