Vizeran DeVir

For each {b} in a cost, you may pay 2 life rather
than pay that mana.
For each {r} in a cost, you may discard a card
rather than pay that mana.
For each {g} in a cost, you may tap an untapped creature you control rather than pay that mana.
Vizeran DeVir costs {1} less to cast for each
Demon Lord you control.