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There are a ton of commanders that support the same archetype in the same colors and swapping just your commander will result in your deck feeling way different, even though the rest of the 99 cards are the exact same

Protect the Patron and build up an army for communal sacrifice

You can also get a Treasure token for ramp in return for attacking before casting this spell

The creatures lost in Tarmogoyf, Steppe Lynx, Wild Nacatl and Death's Shadow are replaced with Thing in the Ice and Kiln Fiend

This lets you get ahead of your mana curve, leading to a snowball of being ahead of your opponents in mana as soon as the game begins