Like, for example, on Dont Blink
However, if you cast See the Truth from anywhere other than your hand - lets say the graveyard thanks to something like Snapcaster Mage - then you get to draw three cards
1 Booster Box has 10 Packs
Chances are afterlife gives you a necessary blocker, other times you get spirits so that you can break stalemates
Using shenanigans like the Monarch mechanic, Eowyns triggered ability or other draw effects from cards like Humble Defector, Archivist of Gondor or Vanquishers Banner, the deck easily refills its hand with threats to amass a token army ( not with the Amass mechanic, though ) to take out your opponents
Many energy cards are primarily designed to be one or the other, and exploiting the differing rates of returns between them using the efficient generators to fuel the powerful outlets is a big part of deckbuilding around this mechanic