Kullervo, Crimson Renegade

({p/r} can be paid with either {r} or 2 life.)
First Strike, Haste
For each {r} in a cost, you may pay 2 life rather
than pay that mana.
Whenever you cast a red spell, deal 1 damage to
target creature or player and give Kullervo
+2/+0 until the end of turn.