If my opponent has 8/10 and he swings and i block with a 7/9 my 9 beats his 8 attack and he loses and that creature that attacked is destroyed? Or does he survivr even though i had higher def than his attack
You appear to have just missed the rulings forum, I'll just shift this over to the correct place.
To answer your question, regardless of which creature is attacking or defending they deal damage equal to their power to the opposing creature.
So in your scenario the attacking creature will deal 8 damage to the blocking creature which will deal 7 damage back to the attacking creature. In this case that means that neither creature will deal enough damage to the other to destroy it and they will both stay on the battlefield.
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How creatures work in Magic is a creature's power will deal damage to the opposing creature's toughness, so in this case the 8/10 is dealing 8 damage to your 7/9. Your creature has 9 toughness, so 8 damage is not enough to kill it. Similarly your 7/9 will only deal 7 damage to the 8/10. 7 damage is not enough damage to kill a creature with 10 toughness, so both creatures will survive combat.
The fist number is called Power, not 'attack'. It is how much combat damage the creature deals.
The second number is called Toughness, not 'defense. It is how much damage is lethal to the creature.
In combat, creatures deal damage equal to their power to whatever they are combating with: a player, planeswalker, or other creature (blocking it or being blocked by it). Then the creaturea may die if they have lethal damage marked on them, as defined by their toughness.
Just figured I would add a bit if you are new to Magic. In the game of magic, when a creature is dealt damage, that damage is marked on the creature only until end of turn. That is, if you attack with your 8/10 and it is blocked by a 7/9, the 8/10 has 7 damage marked on it until end of turn and the 7/9 has 8 damage marked on it until end of turn. If at any point in the game a creature has damage marked on it that is equal to or greater than its toughness(the number on the right in the P/T at the bottom right of the creature card), it is destroyed. At end of turn, all of these effects wear off. The next turn, both creatures will still maintain their same power and same toughness, barring some other effect played during the game.
To answer your question, regardless of which creature is attacking or defending they deal damage equal to their power to the opposing creature.
So in your scenario the attacking creature will deal 8 damage to the blocking creature which will deal 7 damage back to the attacking creature. In this case that means that neither creature will deal enough damage to the other to destroy it and they will both stay on the battlefield.
Moved from MTG General
- H.L Mencken
I Became insane with long Intervals of horrible Sanity
All Religion, my friend is simply evolved out of fraud, fear, greed, imagination and poetry.
- Edgar Allan Poe
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The second number is called Toughness, not 'defense. It is how much damage is lethal to the creature.
In combat, creatures deal damage equal to their power to whatever they are combating with: a player, planeswalker, or other creature (blocking it or being blocked by it). Then the creaturea may die if they have lethal damage marked on them, as defined by their toughness.