St. Marcus Mars (OP13-091) - Alternative Art Deck Box cards on your field is

cards on your field is equal to or less than the number on your opponent's field

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up to 1 of your opponent's Characters

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St. Marcus Mars (OP13-091) - Alternative Art Deck Box cards on your field isCarrying On His Will St. Marcus Mars (Alternate Art) Celestial Dragons, Five Elders If you have 7 or more cards in your trash, this Character cannot be removed from the field by your opponent's effects and gains [Blocker]. [On Play] You may trash 1 card from your hand: K. O. up to 1 of your opponent's Characters with a base cost of 5 or less.