When a face-up Fish, Sea Serpent, or Aqua-Type monster(s) you control is banished: You can Special Summon this card from your hand or Graveyard. (The banished monster(s) must be Fish, Sea Serpent, or Aqua-Type even after being banished.)

3 Link Monsters
Must first be either Fusion Summoned, or Special Summoned from your Extra Deck by Tributing the above cards you control (in which case you do not use «Polymerization»). This card can attack all monsters your opponent controls once each. When an attack is declared involving this card and an opponent’s Link Monster: You can banish 1 Link Monster with the same Link Rating as that monster from your field or GY; destroy that opponent’s monster, and if you do, inflict damage to your opponent equal to its original ATK.

All monsters your opponent controls lose 500 ATK/DEF for each Dragon monster you control. You can only use each of the following effects of «World Legacy Guardragon Mardark» once per turn.
● You can banish 2 Normal Monsters from your hand or GY; Special Summon this card from your hand.
● If this card on the field is destroyed by battle or card effect: You can add, from your GY to your hand, 1 Level 9 monster with a different original Type and Attribute than this card.

2 Warrior monsters
If this card is Link Summoned: You can target 1 «Destiny HERO» monster in your GY; Special Summon it. You can Tribute 1 «Destiny HERO» monster; add 1 «HERO» monster with a different name from your Deck to your hand. You can only use each effect of «Xtra HERO Cross Crusader» once per turn, also you cannot Special Summon monsters the turn you activate either of this card’s effects, except «HERO» monsters.

Reveal 3 «Danger!» monsters with different names from your Deck, your opponent randomly picks 1 for you to Special Summon, and you shuffle the rest into the Deck. During the End Phase, destroy that Special Summoned monster. You can only activate 1 «You’re in Danger!» per turn.