At it's most basic level, Brainstorm only
gains you one card for one mana, so what's so
special about it? For one, you get to look at
three new cards. Then, you choose two cards from
your hand that you won't be needing this turn,
and put them back on the top of your library.
That's a decent effect at an instant speed.
Where it gets really good is when you combo
it with other things. I'm only going to scratch
the surface, but here are a few:
- Any of the miracle cards. You can put them
on top of your library at the end of the
opponent's turn and miracle them on your draw
- Your opponent plays Thoughtsieze (or any
other discard where they get to choose the card
you discard). In response, you Brainstorm to
hide your best two cards on top of your library
so they won't be lost.
- After playing Brainstorm, put two useless
cards on top of your library and use a shuffle
effect to mix them back in and likely get a
I'm sure my fellow reviewers will give
examples of the many other ways to use this card
to its full potential, but suffice it to say
that it's worth playing in almost any blue deck
where it's legal.