There is no clause that says you can cast it as though it were any color of mana
#38 Mindslaver - Bronze Age Mindslaver is deceptively powerful, and has taken its place as one of Vintage's most popular victory conditions when combined with Goblin Welder to control your opponents' turns again and again until he has nothing left
4 Sword of the Animist There are loads of swords in Magic, and many of them are incredible Sinew and Steel, Hearth and Home, Feast and Famine, the list goes on
Swinging out is the easiest way, but you can also drain your opponents' life with cards like Ayara, First of Locthwain, Valley Rotcaller, and Mirkwood Bats or sacrifice your Rats to kill the table with a Blood Artist, Zulaport Cutthroat, or Syr Konrad, the Grim
The first part, 'choice' can get around protection , hexproof , shroud and ward