Cozy Landshark Den

Whenever a Landshark creature you control goes
into the graveyard, place it under Cozy
Landshark Den instead. At the end of turn, you
may pay {w}{g}. If you do, put that Landshark
creature into play under your control. Otherwise,
shuffle it back into its owner's library.
Cozy Landshark Den cannot be targeted by
spells or abilities.