Mirror Wall

Trap Card—While this card is in Foretell, it may
be cast as though it had Flash.
Half the power of any creature attacking you.
At the beginning of each upkeep, you may pay 2
life. If you don't, destroy this enchantment.
Foretell {u/r}{u/r}(During your turn, you may pay {2} and exile this card from your hand face down.
Cast it on a later turn for its foretell cost.)