These effects can range from increasing the damage of attacks, protecting your Pokemon from damage, or even providing multiple types of Energy at once
Set: Base Set 1st Edition Type: Psychic Rarity: Holo Rare Retreat cost: Colorless,Colorless,Colorless
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
For example, if I'm building an aggressive Black-Red Vampire deck that wants one-drops, I'm definitely including four copies of this card: Once again, the power of a 2/1 diminishes quickly as the game goes on
Support Cards Well, nearly every other card in this deck either interacts with the opponent or provides immense card selection