You use characters to defend your faction and locations and to attack your opponent’s faction and locations. You can only play characters during your turn. If at any time the damage a character has received this turn is greater than or equal to that character’s life value, destroy it. (You should only keep track of damage inflicted during the current turn since that’s all that matters.)

A card cannot attack unless it has been in play under your control since the
start of the turn. (It can still use abilities that require depleting.)