When Rise of the Hobgoblins enters the battlefield, you may pay. If you do, create X 1/1 red and white Goblin Soldier creature tokens.
: Red creatures and white creatures you control gain first strike until end of turn.
8/1/2008 When the enters-the-battlefield ability resolves, you choose the value of X, pay for it, and put the tokens onto the battlefield. You can activate mana abilities to pay for , but no one can cast spells or activate abilities in response to this choice.