Deep Water 
Text:
: Until end of turn, if you tap a land you control for mana, it produces instead of any other type.
Rulings:
-
10/4/2004
Deep Waters affects lands you control when it resolves and any lands you gain control of this turn.
-
8/1/2008
The amount of mana produced is unchanged, but it will all be <img src="/Handlers/Image.ashx?size=small&name=U&type=symbol" alt="Blue" align="absbottom" />.
Legality:
-
standard: Not legal
-
future: Not legal
-
frontier: Not legal
-
modern: Not legal
-
legacy: Legal
-
pauper: Legal
-
vintage: Legal
-
penny: Not legal
-
commander: Legal
-
1v1: Not legal
-
duel: Legal
-
brawl: Not legal
-
oldschool: Legal
-
historic: Not legal
-
pioneer: Not legal
-
gladiator: Not legal
-
premodern: Not legal
-
historicbrawl: Not legal
-
paupercommander: Legal
-
alchemy: Not legal
-
explorer: Not legal
-
predh: Legal
-
oathbreaker: Legal
Sets:
-
The Dark
#23
(common)
