Imagine playing this, using the two untapped lands to cast Three Visits, and using the untapped land from Three Visits to cast Green Suns Zenith for one mana to grab a Dryad Arbor
Also, there are lots of X spells that create creatures at instant speed, like Call the Coppercoats, Decree of Justice, White Sun's Zenith, so you could set up an easy win in EDH by casting a big spell, attacking the next turn, and untapping to win
Turn it face up any time for its mana cost if its a creature card.) Whenever a permanent you control is turned face up, if its a creature, you may have it fight target creature you dont control
Secret Lair drops are intended more as limited-printing collectible boxed sets than useful releases with which to build a deck