That doesn't work with Sundial. You have to resolve all of the effects of the spell before anyone else gains priority. You can't end the turn to prevent the discard.
Instead, use Library of Leng so you can choose where the discarded cards go: in the graveyard where you won't have to draw them, or on top in case you wanted those cards. Replacement effects like that DO interfere with the effects of spells and abilities.
Posted By:
DacenOctavio
(10/1/2012 11:46:42 PM)
@SadSushi:
Abilities can't be activated in between drawing and discarding the cards.
Posted By:
TDL
(9/13/2012 2:17:00 PM)
It's so frustrating that the Portal 3K cards are so limited and hard to get in the US or even in English for that matter!
Sound off if you want to see them made available somewhere other than MTGO for us US players!
Posted By:
ong312
(6/3/2011 1:29:45 AM)
another copy of a different magic card, like so may cards from Portal Three Kingdoms.
This / Goblin Lore isn't a really good card anyways; unless you want to quicken some threshold effects...
Posted By:
Mode
(1/4/2009 4:49:02 AM)
Hey cool! It's a big Burning Inquiry!
Posted By:
Test-Subject_217601
(1/19/2011 12:13:37 PM)
I know I may not know as much as most of you guys around here, but in a casual or EDH game, I instantly saw coupling this with Sundial of the Infinite... making this a 2-CMC 4-card draw for Red with no downside.
Posted By:
SadSushi
(9/10/2012 10:02:18 AM)
Anything that says "draw four" for 
can be exploited. Library of Leng comes to mind.
Posted By:
TheWrathofShane
(11/27/2012 2:17:33 PM)