Magic the Gathering (MTG) - Nicol Bolas, the Ravager promo out of a core set 2019 prerelease kit

This promo is over $70 making it one of the best promos ever.

Card Name: Nicol Bolas, the Ravager
Mana Cost: 1BlueBlackRed
Converted Mana Cost: 4

Types: Legendary Creature — Elder Dragon
Card Text:
Flying
When Nicol Bolas, the Ravager enters the battlefield, each opponent discards a card.
4BlueBlackRed: Exile Nicol Bolas, the Ravager, then return him to the battlefield transformed under his owner's control. Activate this ability only any time you could cast a sorcery.
P/T: 4 / 4
Expansion: Core Set 2019 (Mythic Rare) Core Set 2019
Rarity: Mythic Rare
Artist: Svetlin Velinov