yugioh continuous trap cards cannot be destroyed Uria, Lord of Searing Flames [CT03-EN005] Secret Rare LDS2-EN126 - Barrage Blast -

Dragonfly Swarm is both, basically being a twist on Enigma Drake, with ward 1 and drawing a card when it dies as a bonus

With a Maze of Ith or Spires of Orazca (the other side of Thaumatic Compass), you can ensure your opponents wont attack you with more than one creature a turn

Once you sac a large number of creatures, its time to bring them back with cards like Raise the Past and Continue

However, by paying attention to the rarity symbols, and factors such as whether they are holofoil, it is possible to get a good idea of whether a card is worth something

Thats not something to be ashamed of, its just something to have a conversation about