Damage Step

In the Damage Step, the ATK of the attacking monster and the ATK or DEF of the attack target are compared. If a face-down monster is attacked, it is flipped face-up at the beginning of this step. During this step, players can only activate the following. After damage calculation monsters destroyed as a result of battle are sent to the Graveyard.
 * Counter Trap Cards.
 * Trap Cards, Quick-Play Spell Cards, or Quick Effect Monster Cards, that alter the ATK or DEF of a monster such as Reinforcements, Shrink, or Honest.
 * Any card that specifically states it can be activated during the Damage Step.
 * Effects that are activated when a monster is destroyed by battle such as Giant Rat or Masked Dragon.
 * Compulsory Trigger Effects such as King Tiger Wanghu.
 * Flip Effects (Manditory after damage calculation).
 * Quick Effect Monster Cards that can negate the activation of other cards or effects such as Horus the Black Flame Dragon LV8.

Note: The Damage Step is repeated every time a monster declares an attack.