The Swamp Beast

Exile the top X cards of your library. The
Swamp Beast's toughness is equal to twice the
amount of land cards exiled this way. The
Swamp Beast's power is equal to twice the
amount of instant or sorcery spells exiled this
way. Put a +2/+2 counter on the Swamp Beast
for any artifact spells exiled this way.
When The Swamp Beast dies, shuffle the top X
cards from exile into your library.