Advanced format ruling
Elemental HERO Mariner
Card effect (current official text)"Elemental HERO Bubbleman" + "Elemental HERO Avian"
Must be Fusion Summoned and cannot be Special Summoned by other ways. While you have any face-down card(s) in your Spell & Trap Card Zones, this card can attack your opponent directly.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.