1 20 of 73 cards where the text includes return and the text includes instant and the text includes from your graveyard Baldur's Gate Wilderness Dungeon Crash Landing Search your library for a basic land card, reveal it, put it into your hand, then shuffle
Kent Reporter
Then you can exile a graveyard and gain a bunch of life, ramp out two lands of any type not just basics tapped, make a pair of 2/2 Bear tokens, or toss a pair of counters on all of your stuff for the going wide, and with the Bears as a default that's two 4/4s for six mana on a naked board
Most notably it was just the best end-game you could build your deck towards, but its not clear that is really the case anymore as there are cards like Nexus of Fate that can go much bigger
Any free spell enabler is just nasty good in all of the places
If you don't control any creatures with power 4 or greater when the ability resolves, the ability won't do anything