Each symbol represents the rarity of that specific card, and you will usually be able to spot these symbols on the bottom of the card, generally at the bottom right corner, but sometimes on the left as well
A big creature without evasion isnt so good in a sacrifice deck, the cost to draw cards is steep, and the sacrifice ability has issues both with finding fodder and with killing relevant creatures after turn four
I did end up finding room for Augur of Skulls
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In Commander, you'll be able to make good use of Final Showdown, paying six to destroy all creatures, one more when there's something important you want to protect, and one more when you want to get rid of some pesky indestructible stuff too
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