Hydrogeddon is a card that hasn't seen much mainstream play in many years, but here it's very good
For grading its critical and caps your grade
It might seem like having perfect mana is going to be good enough (and with fetch lands, I think it's arguable that you'll be pretty good most of the time), but let's strip that away a little
2004-10-04 The Fork card goes to the graveyard when it resolves and leaves the copy on the stack
It cant be destroyed by battle, your opponent receives all the battle damage as effect damage when attacking into it while it is in attack position, and when it leaves the field by either getting destroyed, banished, sent to the grave or returned to the hand you can summon Loading
Compare this to something like Malamar, which is slower but provides more Energy over the course of a game and you can see a distinction