I think Ral is cool, 4 mana is alot, and needing both blue and red cuts off seething song to cast it. So it might be a bit too slow, but the effect is really really really good. It will suck to draw when the opponent already has creatures on board. Could be a sideboard card against miracles/grixis control.

On the topic of sideboard. Say you play UR (or i guess it could apply to monored as well), you are going to play 5 games vs delver decks (a mix of grixis, ur, uw and rug) with your life on stake. You get to select 5 cards for your sideboard. What would you pick?

Your current sideboard is
1 Grapeshot
1 Pif
1 RoF
1 Empty
1 huf
2 Fiery Confluence
3 flusterstorm