Originally Posted by
Forbiddian
It's tech in like Standard, where blue is the worst color and the lands are crappy, and they splash colors requiring double color requirements, so you can actually give an opponent color screw fits.
In Legacy, blue is the best/most common color by far. Against half the decks or more it just does absolutely nothing. Your opponent also gets the critical first turn with it and then you're stuck down two mana tempi regardless.
All the combo decks still tap for 1 or R, all the stompy decks still tap for 1. Goblins can use T for 1 almost as much as it could use R. Blue decks don't care at all. Ichorid decks can still use blue for Breakthrough or Careful Study or activate Cephalid Coliseum. The best it does, I guess, is stop Cephalid Coliseum. There are so many even non-blue matchups where it doesn't do ANYTHING.
Even in some hypothetical matchup that can't use 1 or U, it could still be used all game to blank your dazes and cursecatchers.
I can't think of a single matchup where you would want it.