Its a fun deck that works to interrupt your opponents plans, then sweep up all the lore in one big turn
The Discover part does mean that this makes sure to give you back a card, but the card you get back wont be impressive enough to offset this cards weak effect, at least not enough for this to be the kind of Red card youre interesting in playing consistently This isnt that far from being Bloodbraid Elf, and that card is absolutely absurd
the other is being very loose about the games edges
Since its release in Zendikar Rising , its become a common finisher for midrange and control decks (such as Four-Color Blink and Elementals)
You can also use cards like Leaf or Budding Expeditioner to make Dialga retreat once your other Pokmon are ready to go without wasting resources
Three novels, some extended edition films, and lots of fan work and speculation