Terrarium

If Fortified land would be sacrificed or
destroyed, you may pay {u}{g}. If you do, search
your library for a land card of the same type and
put it on the battlefield tapped. Then, shuffle
your library.
Fortified land is a white Wall creature with
power and toughness equal to this fortifications
mana cost. It's still a land.
Fortify {1}