Sigma, Astrophysicist

{p/u}{p/b}: Look at the top card of your library:
•If the converted mana cost of the top card of
your library is even, you may put it into your
graveyard, dealing damage to any target, equal
to the converted mana cost of that card.
•If the converted mana cost of the top card of
your library is uneven. You may draw it.
You may only activate this ability during
your turn.