It's not enough to just leave your cards in the box and forget about them
Rampant Rejuvenator On its own, Rampant Rejuvenator is a 4-mana 2/2 that ramps ahead two lands when it dies
Lavaspur Boots gives the equipped creature haste and ward 1, which might not be as solid as hexproof and shroud, but still incredibly good
This is generally used to balance attacks that otherwise have a low Energy cost, such as "Marowak ex", whose "Bonemerang" can inflict 160 damage for 2 Fighting Energy
For example, if you were casting Serra Angel, which costs, you could tap three basic lands of any type to pay plus two Plains to pay
Pale Moon Pale Moon is a blue instant that costs and forces nonbasic lands to produce colorless mana over anything else until end of turn