Green knows its big creatures well, but don't be afraid to branch out for something like Scour from Existence, Magma Opus, and Into the Story
So in a Commander context, I see discard as the best way to describe a swathe of interdependent synergistic mechanics, mostly based in black, which look for advantage by quickly pitching their own hand to the graveyard
Worldly Tutor Worldly Tutor, on the other hand, functions exactly the same as Sylvan Tutor, with the added advantage of being an instant
Though these cards are rare and super rare, they should be easy enough to get your hands on if you're willing to buy multiple copies of this starter deck
For each creature exiled this way, its controller searches their library for a basic land card