Oberon's Promise

Lands have hexproof.
{2}{g/w}: Create a 4/4 legendary white elk spirit
token with flying named "Gale". Activated this
ability only if you control five or more lands.
Whenever Oberon's Promise leaves the
battlefield, exile it and search your library for a
land card and play it, If you control ten or more
lands you may instead search for a creature card.