Mammoth Umbra

Convoke & Totem armor (If the enchanted creature would be destroyed, instead remove
all damage from it & destroy this Aura)
Enchanted creature gains +4/+4 & Trample.
If this is enchantment is in your graveyard &
you get a D20 result of 17 or higher, you may return this card from your graveyard to hand.
(You can only return a single Umbra at a time)