You can even play the exiled cards using whatever mana you have and not worrying about their color identity
Sacrifice does destroy indestructible creatures
Most of that stuff is just copyright info, but the information to the right of that line is what is known as the collector number, and it tells you where the card falls in the set, should you wish to organize your collection in that fashion
Thats probably how I would approach it
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Combat-oriented red Auras also include Dragon Mangle , which cantrips and grants the enchanted creature fire-breathing (getting +1/+0 for R), and Undying Rage , which grants the enchanted creature +2/+2 and prevents it from blocking