The Scythe from above

Once the casting time is up a scythe falls from the sky and you must succeed in a dexterity saving throw or take 1d4 damage. you roll an other d4 to see what enchantments it has. 1= no enchantment, 2= if you roll this you are instantly healed to full health, 3= if you roll a 20 with this scythe than it does x2 damage, 4= the scythe is very heavy and you must succeed on a strength saving throw and if you do the scythe becomes light again and does whatever number of damage you rolled on the saving throw