Kelor, The Cursed

Partner with Etun'jor, The Bound
Whenever Kelor, the Cursed attacks, you may
pay 5 life. If you do, add {b}{r} to your mana pool.
Use this mana only to cast instants and sorceries.
You don't lose this mana until your next endstep.
At the beginning of each upkeep, you lose 5
life for each unspent mana you have in your
mana pool.