Red's strengths are sacrificing resources for great power, dealing direct damage to players or creatures, and destroying artifacts and lands
Don't be afraid to experiment with different art styles some people love a classic anime look, while others prefer a more whimsical or even slightly creepy aesthetic
If there is no Lesson card in your graveyard when Dragonfly Swarm dies, the ability will not be put on the stack at all
Meanwhile, Song-Mad Treachery is a card I really like for a reason similar to Pelakka Predation: people don't expect non-sacrifice decks to have Threaten effects, which means that Song-Mad Treachery can lead to some massive blowouts by stealing an unsuspecting opponent's best creature and smashing them with it
To add even more edge cases, Word of Command allows you to mandate and alternative casting costs are paid
While there are several that Im excited to play, Alchemists Talent jumps out to me as the most generically useful because Treasure is so powerful in Commander these days