Ultra-rare version of cards - "foils" - delivered mainly as prizes from game modes.
Differences to normal cards are these:
1) Kate buys them at flat minimum of 10k per piece making them always worth minimum of 10k
2) On "equal attack and equal level the one who goes in first" rule is changed so that "on equal attack and equal level foil wins, if both have foil then one who goes in first wins" - giving foil cards slight extra edge on playfield.
Chance of any card given from packs
has 1:100 chance of being foil.
Card from Duel mode has 1:1500 chance of being foil
Card from ELO/DT prizes has 1:25 chance of being foil
Card from Coliseum
has 1:50 chance of being foil