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At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.) Company: Wizards of the Coast Series: Rise of the Eldrazi Item Type: Single Card Brand: Magic The Gathering Release Date: April 2010 UPC: 0666714298500 Stock #: 149971 Our Guarantees to You, Our Valued Customer

If my searching prowess is on point, it looks like there are 194 cards with the flashback keyword in the game

Company: Pokemon USA Series: Shining Legends Item Type: Single Card Release Date: October 6, 2017 Brand: Pokemon UPC: 604966651339 Stock #: 175835 Our Guarantees to You, Our Valued Customer

The value of X is determined only as Peer Past the Veil resolves, after you discard your hand

Series: 2002 Collector Tin Company: Konami Brand: YuGiOh Item Type: Single Card UPC: 606583840233 Stock #: 207688 Our Guarantees to You, Our Valued Customer