Riddle, Grung Monk

Double Strike, Reach
When Riddle attacks or blocks, reveal the top card
of your library. Riddle's power equals to the
converted mana cost of the revealed card until
end of the turn. If the revealed card is a land,
Riddle's power is 1 and it gets deathtouch until
end of the turn.
Otherwise, treat Riddle's power as 0.