Manhattan Project

{1}: Put an advancement counter on this
enchantment.
Trinity Test— {3}{u}{r}: Put a Test counter on this enchantment.
{1}{u}{r}: Create an Atom Bomb Token. Activate
only if there are 20 or more advancement counters
on this enchantment. If this enchantment has no
test counters on it, roll a d20. If your roll is under
7, sacrifice the Atom Bomb token.