The Creator [RDS-EN005] Ultimate Rare BT9-068 Nightmare's power and toughness are

Nightmare's power and toughness are each equal to the number of Swamps you control

then you can Set 1 "Purrely" Trap directly from your Deck

Set: 30th Anniversary Edition Type: Instant Rarity: Rare Cost: {U} Change the text of target spell or permanent by replacing all instances of one color word with another

Special Summon 1 "Ultimate Insect LV7" from your hand or Deck

The Creator [RDS-EN005] Ultimate Rare BT9-068 Nightmare's power and toughness areSet: Rise of Destiny Card type: Effect Monster Rarity: Ultimate Rare Attack: 2300 Defense: 3000 Select 1 monster from your Graveyard. Send 1 card from your hand to the Graveyard and Special Summon the selected monster. You can only use this effect once per turn. This card cannot be Special Summoned from the Graveyard.