Brotherhood of the Fire Fist - Bear (UTR) [CBLZ-EN024] Ultimate Rare BW18 you can select 1 face-up

you can select 1 face-up "Mist Valley" card you control

Set: XY: Evolutions Type: Psychic Rarity: Ultra Rare Retreat cost: Colorless

and remove from play 1 face-down Spell or Trap Card

by Tributing 1 Thunder Effect non-Fusion Monster (in which case you do not use "Polymerization")

Brotherhood of the Fire Fist - Bear (UTR) [CBLZ-EN024] Ultimate Rare BW18 you can select 1 face-upSet: Cosmo Blazer Card type: Effect Monster Rarity: Ultimate Rare Attack: 1600 Defense: 1200 Once per turn, when this card inflicts battle damage to your opponent: You can Set 1 "Fire Formation" Spell Card directly from your Deck. Once per turn: You can send 1 face up "Fire Formation" Spell Trap Card you control to the Graveyard to target 1 monster on the field; destroy that target.