Send monsters from the Fusion Deck to the Graveyard is an Effect, NOT a Cost. Send 1 "Impossible Fusion" to the Graveyard is a cost. You can't activate this effect if your opponent hasn't monsters on the Field. Remove from play 1 "Fusion Shield" is a cost. If you haven't enough cards in the Deck, you lose.

Fusion Bomb
Fusion Bomb
Creator Cyberdark Horus
Card type Spell Card Spell
Property Normal Normal
After the activation, randomly Send 3 Fusion Monsters from your Fusion Deck to the Graveyard. Inflict damage at your opponent equal at the monsters' Level total x 100. You can also choose and activate 1 of the followings effects: ● Send 1 "Impossible Fusion" from your hand or Deck to the Graveyard. Destroy 1 monster that your opponent controls. ● Remove from play 1 "Fusion Shield" from your hand or Deck. Draw 2 cards.
Sets Dimensional Invasion - DMIV-EN046
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