I suggest you to change the 8 big guys for this 12 as the threats you want gotta be massive, and should be as hard as they can be to be killed/removed, and you want the enchantment to keep producing creatures so you dont want it back to your hand...
4 Striped River (can be cicled so its not a
dead draw and hexproof)
4
Stormtide Leviathan (An 8/8, that cant be blocked, and stops most of the aggro decks, as few cards are played that fly or have islandwalk)
4
Inkwell Leviathan (7/11 Shroud, islandwalk (so with the other
leviathan cant be blocked and can still attack and if not it has trample so you can avoid chump blocks)