Only 2 mana? Sounds quite playable, and won't affect other formats too much so it could be printable. Unfortunately it hits storm really hard (and at this moment storm is not a deck to punish imho).
Mad Mage - RR
If a player would draw a card from a blue instant/sorcery, he/she discards a card instead.
Whenever a white creature enters the battlefield, Mad Mage does 2 damage to it and 2 to itself.
It attacks blue and white, as red did in the old times.
Priest of blood - 1RR
Sacrifice priest after you have been assigned damage: prevent all that damage and deal it to all other creatures and opponents instead
Say goodbye to alpha attacks (mentor, pyromancer, mud, eldrazi, dredge...)