Devourer of the Deeps

This creature costs {1} less to cast for each card
type in the death zone.
At the beginning of your upkeep, each player
puts the top 2 cards of their library into the
death zone.
When this creature deals combat damage, each
creature that was dealt damage by this creature
phases out if its mana value is less than or equal
to the number of card types in the death zone.