Super Duper Buddy Old Pal

Whenever Super Duper Buddy Old Pal blocks or becomes blocked by a Merfolk, Kraken,
Leviathan, Octopus, or Serpent creature, it
gains deathtouch until end of turn.
When Super Duper Buddy Old Pal is put into a graveyard from anywhere, shuffle it into its
owner's library.
The end...or is it?