Murkletins, King of Ironbone

(Player other than you must complete the riddle.
If not, this card gets specials abilities)
Deathtouch
At the beginner of each upkeep, target player
must have more creature than you. If a player
failed the riddle, create 1/1 Selektol with "When
this creature dies, return target creature from
your graveyard to the battlefield."