Trishula, the Dragon of Icy Imprisonment (Silver) (BLC1-EN045)

3 monsters with different names
Must first be either Fusion Summoned using only monsters in your hand and/or field, or Special Summoned (from your Extra Deck) by banishing the above cards you control. If this card was Special Summoned using only monsters that were originally Dragons: You can reveal and banish 3 cards (1 from your Deck, 1 from the top of your opponent's Deck, and 1 from their Extra Deck). You can only use this effect of "Trishula, the Dragon of Icy Imprisonment" once per turn.