Fire Ball of Ice

You can pay either {u}{u} or {r}{r} for {u/r}{u/r}.
Tap target creatrue and deal 2 damage to it.
Search your library and/or graveyard for a card named Thayou Fullstream of Ice if you paid {u}{u} for {u/r}{u/r} or for a card named Thayou Fullstream of Fire if you paid {r}{r} for {u/r}{u/r}. Reveal it and put it into your hand. Shuffle your library if you looked through it this way.