You could use all that mana to cast tons of Elves, or simply pay a huge amount into one massive Hydra instead
Thanks to the wider pool of cards available, you dont have to stretch your mana quite as much as you would in Standard
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He also gives you reach, as for 1R you can sacrifice a goblin to deal two damage to any target either an annoying creature in your way, or the last few points of damage to your opponent
The deck can run secondary attackers, usually Ultra Beasts which can have some very powerful effects for only one Energy card (think Buzzwole or Nihilego)
While Im unclear on the lore significance, The Flesh Is Weak is a very unique card design that puts +1/+1 counters on your team and turns them into artifact creatures