Burnished Hart - Anytime you can get a good effect like mana ramping on a body is amazing
Between reprints, Commander sets, Universes Beyond, Secret Lairs, and more, Magics total number of cards has ballooned over the years
When you spend this mana to cast a Dragon creature spell, scry 2. (Look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)
If I had to guess, I would say that the 0/1 plant side is the more playable side since it goes right alongside Avenger of Zendikar, but saproling decks are a thing in EDH too
The more expensive it is, the more ramp you need to support it, and the more you need to consider protection