You can pay 1 life and sacrifice another creature to put a -1/-1 counter on one of your creatures
Combined with a playset of Temur Battle Rage and multiple copies of Become Immense, the deck would regularly get a Splinter Twin-esque win out of nowhere with a big, double-striking trampler
Sharuum is known for enabling loops with cards like Sculpting Steel or Phyrexian Metamorph, but even fair versions generate a wall of value with minimal effort
If no card is exiled with this artifact, it can't add mana
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He also lets you take control of another creature on the battlefield when he enters, which you control for as long as you control Silumgar