Talk:Damage Control/@comment-24266433-20150331042900/@comment-5777478-20150402041912

Depending on what your opponent has on the field, you don't have to wait for the attack.

Scenario:  Your opponent has a 3 crit item and two monsters on the field each with 2 crit. The monsters' power total 9k or less. You have 1 life remaining.

If you wait for the attack, the item will deal 1 damage after reduction an you lose.

If you play this effect the instant your opponent enters the battle phase, not only will you have a 10k wall, you'll also b protected this turn from 2 damage. They'd have to link attack with the item and at least one monster to kill Astralkus. Any remaining monster's 2crit damage will be reduced by this.

In fact, this doesn't have to be used defensively. If you strongly believe that Astralkus can win it for you on your turn, use it just to call Astralkus.