My Body as a Shield
Quick-Play Spell
When your opponent activates a card that has the effect that destroys 1 or more monsters on the field, pay 1500 Life Points to negate the activation of the card and destroy it.
This is a very under-utilized card because of the price associated with it. However, being as it can work against a monster effect, spell, or trap, it's more flexible than hoping you have "Divine Wrath", "Magic Jammer", or "Seven Tools of the Bandit" handy. Only if the effect is guarenteed to destroy something will you be able to activate this card as a response immediately afterwards. For the 1500 Life Points, you can make sure that the monster(s) you want to keep stay alive. Note that the monster must be destroyed ("Tribe-Infecting Virus", "Fissure"), and not merely sent to the graveyard ("Last Turn", "Chaos Emperor Dragon - Envoy of the End"). Also, the 1500 Life Point payment is part of the effect of the card, not the cost to activate it so "Spell Economics" won't help you either.
All and all though, it could be worth running 1 or 2 for a suprise counter to what your opponent may have for you.
Quick-Play Spell
When your opponent activates a card that has the effect that destroys 1 or more monsters on the field, pay 1500 Life Points to negate the activation of the card and destroy it.
This is a very under-utilized card because of the price associated with it. However, being as it can work against a monster effect, spell, or trap, it's more flexible than hoping you have "Divine Wrath", "Magic Jammer", or "Seven Tools of the Bandit" handy. Only if the effect is guarenteed to destroy something will you be able to activate this card as a response immediately afterwards. For the 1500 Life Points, you can make sure that the monster(s) you want to keep stay alive. Note that the monster must be destroyed ("Tribe-Infecting Virus", "Fissure"), and not merely sent to the graveyard ("Last Turn", "Chaos Emperor Dragon - Envoy of the End"). Also, the 1500 Life Point payment is part of the effect of the card, not the cost to activate it so "Spell Economics" won't help you either.
All and all though, it could be worth running 1 or 2 for a suprise counter to what your opponent may have for you.