There's a wide variety of instants, sorceries, and even cards that interact with a few specific mechanics that will help you get ahead in card advantage, the iconic concept Magic: The Gathering players constantly look for
You put six mana in and, in theory, you save at least six mana when casting your equipment
Then this card is returned to the battlefield as Sheoldred to start over again
It's pretty bad news if your opponent kills this after he forces you to bounce a land, but if they don't kill him, he does make sure you don't fall behind on mana because he lets you play extra lands
Molten Collapse, lets go
One of the times it isnt good is in decks that have a lot of colored pips, and for those occasions, Sceptre of Eternal Glory is here to offer you a deal: if you can get three lands with the same name into play, you can have three colored mana instead of three colorless