Engendro isla caparazón

Isleback Spawn

Shroud (This creature can't be the target of spells or abilities.)
Isleback Spawn gets +4/+8 as long as a library has twenty or fewer cards in it.

Salvat 2011

The more deadly the lake monster, the shorter the tale.

Shadowmoor

Shroud
Isleback Spawn gets +4/+8 as long as a library has twenty or fewer cards in it.

It doesn’t matter which library has twenty or fewer cards in it, and you don’t have to specify a library. If multiple libraries have twenty or fewer cards in them, Isleback Spawn will still get its bonus only once.