At each end step, if any creature died that turn, you get a Food token, which can be sacrificed for life later
Gadrak is one part Anax, Hardened in the Forge and one part Teshar, Ancestors Apostle, but Ive decided to add a dash of Ravager Affinity meets Ironworks combo. There are several loops available for a combo finish, which often involve cycling two Junk Diver variants with either a Krark-Clan Ironworks or Ashnods Altar (occasionally requiring a cost reducer)
Each of these examples works differently, but in the end you aim to finish your games by engaging in combat
Even in the early game, if you have a cheap commander in play it can set you ahead several turns over your opponents
Any repeatable proliferate effect synergizes well with everything from planeswalkers to poison counters and beyond