Robert House, Mojave Tycoon

Defender, double strike
At the beginning of your upkeep, you may pay
{x}. If you do, roll a 6-sided die that many times.
Create a treasure token for each number above 1
that was rolled.
Sacrifice X treasure tokens: Search your library
for a creature or artifact with mana value X or
less, put it onto the battlefield tapped, then
shuffle your library.