The Angel that Wept

Protection from Colors, Indestructible, Flying,
Defender, Cannot Defend.
The Angel that Wept's power and toughness are
equal to the combined power of tapped creatures
all opponents control.
During your upkeep, The Angel that Wept loses Defender and Indestructible if all opponents
have no untapped creatures until end of turn.
...you can't kill a stone. Of course, a stone can't kill
you either, but then you turn your head away...