Ikthul, the Conduit

Whenever a Shaman enters the battlefield under
your control add {r} to your mana pool
Whenever you lose unspent red mana you may
have Ikthul deal that much damage divided as you
choose among any number of target opponents.
If you control seven or more Shaman creatures,
Ikthul deals twice that much damage divided
among any number of targets instead
"Fire is chaos; I am its conduit."