Fetch lands are the best tool for making sure that you have the correct colors of mana to cast your spells
This three-mana Dragon prevents activated abilities of artifacts, creatures, and planeswalkers from being activated
This means that, if an opponent is trying to target your permanent with a spell or ability, flickering or blinking will cause it to fizzle and no longer resolve
If you start casting a spell, then go to activate mana abilities to pay costs during the cast, and you accidentally make it so that you cant pay for the spell, the game rewinds, you untap everything except your mana abilities that interacted with libraries, and you get another try at it
With the Beginner Box, it is a good place to begin but as a place to begin a collection, there are far better options