There are a couple of unobtainable scythes that are only accessed from the creative menu.
-7 Unobtainable Scythes that are obtained through the creative menu.
-7 Craftable scythes that all have custom powers.
Uncraftable Scythes
Grace: Right click to fire a wither skull, and anytime you hit a mob, it grants you strength.
Nannas Scythe: Right click to grant Instant health for 20 seconds
Broodweavers Sickle: Mobs hit with this weapon are given the poison effect
Eager Edge: Right click to smite any entity within 20 blocks of you
Humility: WIP
Sol of Frost: Mobs hit with this weapon are given the slowness effect
Tidepod Terminator: Mobs hit with this weapon are granted the levitation effect for a very long time.
Craftable Scythes
Flame Scythe: Right click to fire a ghast fireball
Enderman Scythe: Right click to teleport 15 blocks in any direction you are facing.
End scythe: Right click to fire the ender dragons fireball
Nitrosis Scythe: Right click to summon a lava source block on the block you are standing on.
Scythe of Purity: Mobs hit with this weapon are given slowness, weakness, wither, and blindness.
Golden scythe: Right click grants the user 7 more hearts for 10 seconds
Voidling scythe: Right click to fire a fast, piercing arrow in the direction you are facing