Sezegor, Head Occultist

Hexproof
Whenever you Cast an Instant or Sorcery spell
with converted mana cost 5 or 6, you may pay {u/b}{2}.
If you do, cipher that spell onto Sezegor. If you
do not, draw a card.
{u/b}{1},Sacrifice a creature: Sezegor becomes unblockable until end of turn