yugioh boss deck Level 7 main monster : r/customyugioh Structure deck boss monsters are

Legendary Creature - Elf Noble Colossal Whale Islandwalk (This creature can't be blocked as long as defending player controls an Island.) Whenever this creature attacks, you may exile target creature defending player controls until this creature leaves the battlefield

First, you will need crush card or a card that has an effect that turns terrain into crush (Two Dark Plants, Slate Warrior, Crush Card and Magician Of Faith recommended)

Port Razer's last ability doesn't stop it from attacking a planeswalker or battle during any combat

During your Standby Phase, if this card was destroyed since your last Standby Phase: You can Special Summon 2 "Double Dude Tokens" (Warrior-Type/DARK/Level 4/ATK 1000/DEF 1000)

It's a creative take that adds to the card's charm