These effects can range from increasing the damage of attacks, protecting your Pokemon from damage, or even providing multiple types of Energy at once
Sometimes you just use it as a mana sink to convert your weaker cards into more gas
It works particularly well in this archetype because leave the graveyard cards are often triggered by other things that generate an advantage: You might return creatures to your hand with a Regrowth, reanimate a creature, play lands from your graveyard, etc
Card not found, on the other hand, is interesting, but not very good
Support Cards Well, nearly every other card in this deck either interacts with the opponent or provides immense card selection
Despite its popularity across all formats, multiple reprints since its debut in Conflux have dropped its price to only $2