Bernie, Butcher of the Market

When Bernie, Butcher of the Market enters the
battlefield, take down wall street. (Destroy all
walls each player controls, you gain life equal to
the toughness of each creature destroyed this turn.)
Trample, first strike, vigilance
Ninjutsu {2}{u}{u}{r}{r}: (Return an unblocked
attacker you control to hand: Put this card onto
the battlefield from your hand tapped and
attacking.)