Berserker Soul

Split Second & Dual Cast
Mill cards from the top of your library until you
mill a non-creature card. For each creature card
milled this way, target creature you control with
power 4 or less makes an additional attack this
combat and gains Indestructible & Trample until
end of turn.(If the creature is blocked, it counts
towards one of the attacks. If any of its attacks are unblocked, it will still hit the opponent directly.)