Viviketh, Ætherborn Lich

Indestructible, Ward-Discard a card, Pay 5 life
When you cast Viviketh, Ætherborn Lich destroy
target artifact or enchantment and gain {e} equal
to the mana value.
You may play an additional land.
At the beginning of your endstep, if you gained 5 {e} or more you may exile a card from the top of
your library. Until the end of your next turn you
may play that card.