Dethrone (Whenever this creature attacks the player with the most life or tied for most life, put a +1/+1 counter on it.) Whenever this creature attacks for the first time each turn, if it's attacking the player with the most life or tied for most life, untap all attacking creatures
Heck, you could even go as far as untapping four Persistent PetitionersPersistent Petitioners to mill more cards
Unexpected Windfall is an okay card to play in treasure decks, or as a way to discard and draw, but nothing more
The back side requires an even amount of blue on all four sides
Lion's Eye Diamond Market Price: $419.72 However, the most valuable card from Mirage as well as the most valuable card across all of Mirage block is this reasonable facsimile of the most famous Magic card of all time: Black Lotus
And if a noncreature artifact becomes tapped, it will turn off and lose all of its abilities until it untaps