If Quicksilver, Brash Blur is in your opening hand, you may begin the game with him on the battlefield. Haste (This creature can attack, and as soon as it comes under your control.) Power-up — : Put a +1/+1 counter and a double strike (This creature deals both first-strike and regular combat damage.) counter on Quicksilver. (Activate each power-up ability only once. Reduce the cost by his mana cost if he entered this turn.)