Its real strength lies in being able to play artifacts from among the cards it exiles, giving them affinity as well, which can often result in playing colorless artifacts for free
I expect Goblin Chieftain to sit on sideboards 3/4 of the time, it is a calculated tradeoff
It wont go in every deck, but itll be easier to execute than Angel of Destiny if you build it right
The exile clause is the most important part about this card, which is super useful for getting rid of cards like Memory Deluge, Squee, Dubious Monarch permanently
That nulls the effect of dying by sacrificing the aura instead, protecting your valuable creature
For one thing, life advantage doesnt translate well into other aspects of the game, such as having more cards in hand than your opponent or having better creatures on the battlefield