Dorian, Spell Sifter

{u}: Put a card from your hand onto the bottom
of your library. If you do, draw a card and put a
-1/-1 counter on Dorian, Spell Sifter.
At the beginning of your upkeep, you may pay {x}. If you do, remove X -1/-1 counters form
Dorian. Otherwise remove a -1/-1 counter from
Dorian.
"Push yourself beyond your limits. Just not too far."