Emerald Dragon is a great example of how to give card advantage without drawing cards, though Id argue that white deserves it more and has the more playable version in Crystal Dragon
Charizard EX, for example, can hit for 200 damage with Crimson Storm but that attack costs four Energy to use: with a lucky Moltres turn, though, Charizard can instantly have three Energy before it even evolves
I can perfectly imagine that decks will adapt their builds so that they are hurt less in case a bad mill from PokStop happens, but I totally see this card as a must-have for strategies like Mad Party, Zoroark Toolbox and maybe turbo decks
This practice serves a dual purpose of depicting long-beloved Pokmon in a brand new way, and also providing extremely rare versions of previously printed cards
If an effect would set your life total to a certain number that's different than your current life total, that part of the effect won't do anything