Dracona Optimai

A red card is a card with a red color bar (usually at the top of the card).

“When this attacks” is a triggered effect that triggers when the dragon is considered to have attacked, during the attack step. It does not trigger if the combat chain closes in the layer step of combat. After it triggers, it will still resolve even if the dragon ceases to exist or the combat chain closes.

If you have 2 or less cards in your deck you reveal the entire deck. You still deal damage equal to the number of red cards revealed this way.

The cards are revealed before the hero or an ally they control is selected to be dealt damage.