Elemental Hero Stratos [PT03-EN002] Common OTS Tournament Pack 9 You can only use this

You can only use this effect of "Subterror Behemoth Ultramafus" once per turn

decrease the ATK and DEF of all your opponent's monster by 700 points

destroy those targets

(You do not use "Polymerization"

Elemental Hero Stratos [PT03-EN002] Common OTS Tournament Pack 9 You can only use thisSet: Pharaoh Tour Promos Card type: Effect Monster Rarity: Common Attack: 1800 Defense: 300 When this card is Normal or Special Summoned: You can select and activate 1 of these effects: Destroy Spell or Trap Cards on the field up to the number of "Elemental Hero", "Destiny Hero" and "Evil Hero" monster you control (not counting this card). Select and add 1 "elemental Hero", "Destiny Hero" or "Evil Hero" monster from your Deck to your hand.