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A couple of simple questions regarding possible differences between the virtual and card game:

I use Enlightned Tutor to fetch planeswalkers. Can it be done in the board game as well?

When I use Momentary Blink in a creature with the sacrifice effect from Sneak attack it loses the effect and isn't destroyed. Does it work like this in the board game?

Finnaly, Illusionary Mask: when a Phyrexian dreadnought is put into play through it I guess, reading the rules, I'm not supposed to sacrifice anything right?

Enlightned Tutor can't fetch planeswalkers, this is a limitation of engine / coding that they appear as enchantments.

Sneak Attack:

10/4/2004: You only sacrifice the creature if you still control it at end of turn. If that creature has left the battlefield and come back, you don’t sacrifice it.

Illusionary Mask

# 10/4/2004: The creature enters the battlefield face down, so none of its "enters the battlefield" abilities will trigger or have any effect. Also none of its "As this enters the battlefield" abilities apply.
# 10/4/2004: The creature's "enters the battlefield" abilities (and any other abilities relating to the creature entering the battlefield) do not trigger when it turns face up.

So yeah, some things work as intended rules wise and some are approximations that might be rule illegal.
You can easily check rulings at http://magiccards.info which also links to Crystal Keep Rulings Summaries.

Thanks. Great site.

The game is a card game not a board game .