Everlasting Dragon

Indestructible, flying
When Everlasting Dragon enters the battlefield,
you may give it a -1/-1 counter, if you do, search
your library and/or graveyard for a card named
Dragon Greatsword, reveal it, and put it into
your hand. If you searched your library this way, shuffle it.
{1}{b}: Put a 1/1 black Hollow creature token
onto the battlefield.