Koraidon, Winged King

Haste, Trample
Whenever Koraidon, Winged King attacks, you
may put a land or creature card from your hand
onto the battlefield, if a creature card is put onto
the battlefield this way, that creature enters the battlefield tapped and attacking.
This seems to be the Winged King mentioned in an old expedition journal. It was said to have split the land
with its bare fists.