Riviere, River King

When Riviere or a nontoken Fish creature enters
the battlefield under your control, create a 1/1
blue Remora creature token with "This creature
gets +1/+0 for each Fish you control."
Fish creatures you control gain Islandwalk.
Whenever one or more Fish creature you control
die, put a +1/+1 counter on Rivierie.
One fish to rule them all.