Vaelor the Nest Guardian

Flying, Owls you control have Lifelink.

When Vaelor enters the battlefield, create three 1/1 green Owl creature tokens with flying.

{6} Sacrifice an Owl. Search your library for a creature card and put it on the battlefield tapped. It's an Owl in addition to other types.

From the highest branch, I watch the world below, vigilant and wise.