Elemental Token [Duel Decks: Merfolk vs. Goblins Tokens] Gateway 2008 You can only use this

You can only use this effect of "Super Anti-Kaiju War Machine Mecha-Thunder-King" once per Duel

Set: Duel Decks Anthology Type: Creature — Antelope Beast Rarity: Uncommon Cost: {2}{G}{G} Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking

Set: Mirrodin Type: Enchantment Rarity: Rare Cost: {3}{U} Each noncreature artifact is an artifact creature with power and toughness each equal to its mana value

but its speaker is

Set: Structure Deck: Realm of the Sea Emperor Card type: Normal Trap Rarity: Common Attack: 0 Defense: 0 When a monster(s) is Summoned: Destroy all monsters on the field

Elemental Token [Duel Decks: Merfolk vs. Goblins Tokens] Gateway 2008 You can only use thisSet: Duel Decks: Merfolk vs. Goblins Tokens Type: Token Creature Elemental Rarity: Common