3 color infi attack

[Deathseide]

{mirror gallery},  {Intruder Alarm},  {Szadek, Lord of Secrets} equipped with {splinter twin}, and a {breath of fury} to play on one of the Szadek copies.

[MarduArrow]

Even easier:  {Savage Beating} imprinted on  {Spellbinder} + any unblockable creature

[Deathseide]

Of course, but it is more fun to hit their library as well as them...

[MarduArrow]

Then by all means equip it on  {Szadek, Lord of Secrets}