Annihilator
When a creature with annihilator attacks, the defending player must sacrifice a number of permanents. (Artifacts, creatures, enchantments, and lands are permanents.)
For example, when a creature with annihilator 4 attacks, the defending player must sacrifice four permanents. The permanents are sacrificed as soon as the creature with annihilator attacks. This happens before creatures can block, so a creature sacrificed this way won’t be able block an attacking creature.
Deathtouch
Creatures dealt damage by something with deathtouch are destroyed.
Defender
Creatures with defender can’t attack.
Detain
When a spell with detain resolves, or a permanent with detain enters the battlefield, it's controller may choose a permanent to detain. The detained permanent can't attack, block or activate abilities until the next turn of the spell or abilities controller.
Double Strike
A creature that has double strike deals damage twice in combat, once when creatures deal first-strike damage and again when creatures deal regular damage. It’s possible for a creature to be destroyed before it can deal its combat damage.
Evolve
"Evolve" means "Whenever a creature enters the battlefield under your control, if that creature’s power is greater than this creature’s power and/or that creature’s toughness is greater than this creature’s toughness, put a +1/+1 counter on this creature."
Exalted
Whenever one of your creatures attacks alone, it gets +1/+1 for each card with Exalted you have on the battlefield.
First Strike
Creatures that have first strike deal combat damage before other creatures. It’s possible for a creature to be destroyed before it can deal its combat damage.
Flying
Creatures with flying can’t be blocked except by creatures with flying or reach.
Forestwalk
A creature with forestwalk can’t be blocked while attacking a player who has a Forest on the battlefield.
Haste
Creatures with haste ignore summoning sickness. They can attack and their abilities can be played as soon as they enter the battlefield.
Indestructible
An indestructible permanent can’t be destroyed.
If a spell’s effect would destroy an indestructible permanent and do something else, only the part that destroys a permanent does nothing.
If an indestructible creature has been dealt enough damage to destroy it, the creature is not destroyed.
Indestructible permanents can still be sacrificed, returned to their owners’ hands, exiled (removed from the game), and put into their owners’ libraries.