Text (TE+errata): {3},{Tap}: Put the top two cards of target player's library into that player's graveyard. If both cards share a color, repeat this process. [Oracle 1999/05/01]
The effect repeats as many times as it takes to meet the end condition. [Duelist Magazine #23, Page 23]
If the two cards are both colorless, then the effect does not repeat. It only repeats if both cards have at least one color and at least one color is shared between them. [D'Angelo 1998/01/06]
Remember that land cards have no color. [D'Angelo 1998/02/03]
