Aboleth

Abjure {2}(You may have an opponent cast target
noncreature, nonartifact spell in their graveyard with
a converted mana cost 2 or greater for {0}, then exile it
to reduce this creature's mana cost by {u}.)
Islandhome
Sacrifice Aboleth: Target creature blocking or
blocked by Aboleth gains Islandhome.
"Only dead fish swim with the stream."