After the attacking player declares attackers, the defending player chooses which creatures he or she will block with. A creature must be untapped in order for it to block.

Can you sacrifice an attacking creature?

yes, you can absolutely sacrifice a creature that is attacking.

What happens if you sacrifice a blocker?

If you sacrifice an attacking or blocking creature during the declare blockers step, it won’t deal combat damage. If you wait until the combat damage step, but the creature you wish to sacrifice is dealt lethal damage, it’ll be destroyed before you get a chance to sacrifice it.

What happens when I sacrifice a blocking creature?

702.19c If an attacking creature with trample is blocked, but there are no creatures blocking it when damage is assigned, all its damage is assigned to the player or planeswalker it’s attacking.

What happens when you sacrifice a creature in RuneScape?

Players assign combat damage. Combat damage is dealt. Players may cast instants and activate abilities. Combat damage no longer uses the stack, so by the time you are able to cast instants and activate abilities in the Combat Damage Step, combat damage has already been dealt and any creatures dealt lethal damage have died.

What happens when you declare a blocker in RuneScape?

Nowadays, you declare blockers, and then both players have a chance to play spells and abilities. Once everyone is finished doing this, we move onto the combat damage phase, and only then do creatures even start thinking about dealing damage to each other.

When do you declare a blocker in magic?

There was a fairly long period of time ending with Magic 2010 when you could put damage on the stack, and then play instants and abilities before the damage resolved. Those days are over! Nowadays, you declare blockers, and then both players have a chance to play spells and abilities.