Whenever it enters the battlefield or attacks, you return a permanent with mana value 3 or less from your graveyard directly to the battlefield
If you discard a card while a spell or ability is resolving, the triggered ability resolves after you've finished resolving that spell or ability
However, if you play multiple archetypes (yellow, purple, Supernova), a box can provide solid deck-building material across several strategies simultaneously
Consider that, while most e-Reader cards had white scanning Dot Code bars, Pokmon TCG cards instead had yellow borders: Now I guess they couldve just fixed any possible issues with having a yellow background by simply using a WHITE background but, I dunno
Good sleeves may seem simple, yet they play a huge role in preserving expensive collections for years