Sometimes it is counter the thing that was going to kill you and bounce the thing stopping you killing them
Yes, the cards you draw will always be lands and yes, no matter how well you shuffle your deck after, you draw another land way too often because variance hates you
Ready to Play: Unbox this deck, and you'll find everything you need for an exciting Commander game night
Dredge decks effectively empty their entire libraries into their graveyards, then take their pick of powerful effects
Then, every time a creature with power four or more enters the battlefield under your control, you get to draw a card if you want
However, if no Humans have died under your control so far this turn as your end step begins, the ability won't trigger at all