Sacrifices grant life, cards, and stackable counters that prepare your next victim for gainful harvesting or pump your attackers for a deadly push
Krark, the Thumbless is a good option, allowing you to get extra Oozes from Slime Against Humanity, while giving you access to red and all the haste enablers you could want
Field of Ruin + Demolition Field These cards see a lot of play in formats like Pioneer and Standard as a way to snipe a problematic nonbasic land like a creature land or a Mirrex
To give yourself the best chances in an extended tournament or competition, you will definitely want some responses to those archetypes, so you should consider running tech options such as: Compulsory Evacuation Device, Ceasefire, Magic Cylinder, Phoenix Wing Wind Blast, Karma Cut, Different Dimension Ground, D.D
Ever since then, Ive adored the cards and became desperate to get my hands on one