The very first Dragon that made the cut was Hellkite Overlord
When the mana is available Deed also finds its way into control decks, giving Oath of Druids players a way out of almost any jam while often leaving their chosen creature intact, and in the old days serving as an unexpected Tutor target that could turn the game around out of nowhere
So, for example, if your top two cards are Brainstorm and the transforming double-faced card Delver of Secrets // Insectile Aberration, you will end up with a modal double-faced card in one of the following permutations: Brainstorm // Delver of Secrets, Brainstorm // Insectile Aberration, Delver of Secrets // Brainstorm, Insectile Aberration // Brainstorm
The Barbarian Class remains in play and allows the player to roll with advantage, i.e., use two dice and use the higher result
Its also an example of the galaxy-brain thinking Wizards of the Coast have to apply to new cards so they fit into their game-wide rules around rarity
Additionally, mana dorks don't work if this card is out