For example, if the card is a creature card, you can cast that card by paying its mana cost only during your main phase while the stack is empty
With 1 Strength and 2 Willpower, he gains an extra 2 Strength when Challenging due to the Challenger +2 keyword
[-3]: Destroy target nonland permanent with converted mana cost 3 or less
As were seeing now, this can result in a fairly impressive price spike, which may not come down soon
2 Team Rockets Moltres ex (Special Art Rare) $89.90 Moltres adds another card to some of its most valuable, as this amazingly valuable Glory Of Team Rocket chase card blows its competitors, save for one, out of the water
With all the meta changes since then I can fully see how the card would now be oppressively good