Sion, Undead Juggernaut

You may cast Sion, Undead Juggernaut from
your graveyard, if you do you may pay {1}{b}
instead of paying Sion, Undead Juggernaut's
mana cost.
Whenever Sion, Undead Juggernaut deals
combat damage to a player you may
destroy target artifact, if you do, sacrifice Sion,
Undead Juggernaut
If you cast Sion, Undead Juggernaut from a
graveyard he gains haste, menace and trample