mtg sets with serialized cards On Sale Now: TCGplayer's Collection of Serial Printings of Serialized Cards

Unlike regular cards, these feature two Ink icons instead of one

Celes, Rune Knight is a Mythic, Legendary Creature - Human Wizard Knight card from the Magic The Gathering set Universes Beyond - Final Fantasy - Commander (MTGSC-FIC-0167)

One mana turns into two the first turn you bring it into play, and then you just get two colorless mana every turn thereafter

As proxy cards are made from actual cheaper bulk common Magic the Gathering cards, they will still have the same back as the normal cards

Its a discard outlet by itself, and you can easily build a Voltron deck or reanimator deck around it

So, if you have any high-value cards or potentially high-value cards, its recommended to store them in sleeves or penny sleeves and put them in top loaders or boxes versus binders