The keywords and mechanics are what make this a wonderful card: Flying and haste make it fast and able to avoid many answers, and even though the plot cost isnt cheaper than the mana value, this card can swing for a massive amount of damage after its cast from exile
And since he costs 5 mana of each color he's not easy to do, and therefore isn't as abusive as Jhoira, but still has access to three more colors
This is also valuable in token decks, as generating a lot of 1/1 or 2/2 tokens would reliably trigger Enduring Innocent's card draw.
Hourglass of the Lost Hourglass of the Lost is a valuable mana ramp
As you collect new cards, you can improve upon the starter decks by adding in new and better spells that make for more effective combos
Whenever another creature enters, this creature deals 1 damage to that creature's controller