Sandra, Magical Prodigy

{t}: Put a soul counter on Sandra, Magical
Prodigy.
{t}, {1}{u}: Remove all soul counters from Sandra.
Exile target nonland permanent you don't
control with mana value lesser or equal to the
number of removed counters.
"Every complex object is just a union of smaller,
simple parts. Once you understand that, it's easy to
pick things apart."