Is there...

[SPiNx975]

a standard red, black, or white (or any combination of these) card that makes a creature unblockable?

[Rass]

 {Executioner's Hood} kinda works

[The1337Magician]

 {Brave the Elements}?

[Falcon182]

 {Glaring Spotlight} or  {Rogue's Passage} maybe?

[SPiNx975]

well since few of these actually make it unblockable, are there any that give flying?

[Anoobass]

 {Shiv's Embrace}

[Monrodesign]

well since few of these actually make it unblockable, are there any that give flying?

{Gift of Orzhova}

[gtfotis]

{Shiv's Embrace}