Even if it doesn't survive the crackback, that early pressure is still likely to win you the game
Being good at a lot of things rather than great at one thing leads to the ability to include a lot of unique corner-case effects in your deck, like countering a spell that targets you with Dawn Charm or gaining control of a nonland permanent with a mana value of one or less using Archmage's Charm
If Sauron, the Necromancer leaves the battlefield before the delayed triggered ability resolves, that ability will exile the token, even if Sauron, the Necromancer later returns to the battlefield or you control another copy of Sauron, the Necromancer as your Ring-bearer.
Call of Legends clearly has an impressive grip on the most expensive cards from the HeartGold & SoulSilver era, as many of the most expensive cards hail from this set
Lifegain wins with either drain effects or going wide using your life total as a weapon
The Treasure token is super useful just in case your opponents cards are of colors your lands cant produce