This is such a pivotal effect for graveyard decks precisely because most reanimation spells require a graveyard to work something which can be interrupted by vigilant opponents who are tired off your shenanigans
The cards have been pre-set to walk through the players on how to play, using the instructions and the videos, so for the first few turns you play along with the video to learn how to play
Once the cultivator Colossus is played, its controller can put a land from their hand onto the battlefield and draw a card, repeating this process any number of times
As a fan of Zedruu, the Greathearted, Im more inclined toward the latter, but beware blink decks if you go this route
You may put that card on the bottom of that player's library
You have unlimited cards, and every turn you can search up the same three Lands