Thats the Charizard effect
Deviate from those ratios too many Pokemon, too few draw supporters, the wrong energy count and your deck becomes a lottery ticket rather than a competitive tool
4 Charred Graverobber Bring Out Your Dead As long as you have one other outlaw creature in your graveyard, Charred Graverobber is essentially a free card
Card Text: Spell and abilities your opponents contorl can't cause you to discard cards or sacrifice permanents
Therefore, you'll need some pretty great ways to utilize energy in order to make this guy worth it, especially for four mana
As your life points tick down, you can flip facedown cards representing each life point to your hand - if the card drawn has a 'trigger' effect, this can be activated immediately to shake things up