Oath Under the Blood Moon

All non-land permanents you don't control have
no abilities.
All lands you don't control lose all abilities then
gain "Sacrifice this land: Add one mana of any
color to your mana pool."
Sacrifice two lands: This enchantment gains indestructible.
Those who incur the wrath of the Avatar of Worlds
often lose the right to do as they wish without a cost.