Along with the MTG Arena tutorials weve already mentioned, Wizards of the Coast has great introductory explainers that explain the very basics
They are not only rare but also very powerful
In Commander his deck should contain plenty of red cards with high mana values and casting cost reduction, such as Blasphemous Act or Volcanic Salvo - you want cards that you can pitch to get a huge Blazing Shoal pump, but which you also have a good chance to cast normally
Sure ill play it for 5-mana! Not to mention the card also double counters on one of your creatures twice after already doing that powerful effect, making this card extremely high value
In an angel-focused deck where youre constantly gaining life and your creatures are evasive, this card can lead you to a swift victory
I wouldnt play it without ample fodder to trigger the Wizard token, though