It's probably used in this list to ensure you always have a backup Energy for when you use Max Potion
The Scarlet Witch FromTheShire: Breaking news, cheating big mana spell costs is strong
A resource system like I brought up earlier is often a core part of a game's mechanics and I'll explain that more later, but other conditions can exist that limit the ability to play a card, or makes them less effective if they are played outside of their archetype
//// Ratchet, Rescue Racer Color indicator: white Legendary Artifact Vehicle 1/4 Living metal (As long as it's your turn, this Vehicle is also a creature.) Lifelink Whenever one or more nontoken artifacts you control are put into a graveyard from the battlefield, convert Ratchet
For just 1 mana, it makes every opponent discard and lose life right away, then later cashes in for a scry to smooth your draws