Treetop Behemoth

Whenever you cast another creature with
Hivespawn, you may search your library for a
basic forest. Reveal it, and put it onto the battlefield tapped. Then shuffle your library.
Hivespawn (When you cast Treetop Behemoth, if you control another creature with Hivespawn exile Treetop Behemoth. If you do, that creature gets +6 +6 and "Whenever you cast another creature with Hivespawn,
you may search your library for a basic forest card.
Reveal it, and put it onto the battlefield tapped. Then shuffl