It's Time to Duel

If It's Time to Duel is in your opening hand, you
may begin the game with it on the battlefield. All creatures have vigilance and haste. A creature's
owner may cast it to the battlefield tapped. Any
tapped creature may block as though it were
untapped and assigns combat damage equal to its toughness and has trample. Creatures blocked by
one or more untapped creatures gain trample
while attacking.