Sindain, Infernal Duke

At the beginning of your upkeep, roll a d20.
Sindain, Infernal Duke gains Ward {x}, where {x} is the result.
{t}, target a nonland permanent, its controller
rolls a d20. Destroy the permanent unless its
controller rolled a 17 or higher.
"Do you have any comprehension of the power with
which you deal?" -Sindain, Infernal Duke