Fun fact: when I first saw this card, I misread
"search libraries" as "shuffle libraries," and
started worrying about how it would affect
Oblation and Soldier of Fortune. Having read the
card more carefully now, I realize the answer to
that question is "not really at all," but I now
expect it to have a high impact on gameplay. As
long as people play with fetchlands and Primeval
Titan, or rely on Mystical Teachings or Diabolic
Tutor to give them answers on demand, this card
will be an option to fight back. It's another of
those effects that you wonder how it took so
long to make, and one of those effects you can
easily turn to your advantage.
Today's card of the day is Leonin Arbiter which
is a two mana 2/2 that can really ruin the day
of decks that rely on searching their library,
particularly Valakut land based designs.
For what is pretty much a Grizzly Bear or
Silvercoat Lion with an effect that hurts your
opponent, if your deck is built with it in mind,
this is a great control card.
The low cost allows this to easily fit into the
mana curve and fulfill a damage dealing function
in addition to slowing down an opponent's
strategy, so overall a solid investment.
At worst a sidedeck card to use against
aggressive deck searching, but a very nice
addition to White or Blue/White decks in
general.
For Limited there isn't much to search in your
library, but a two mana
2/2 is quite solid and worth drafting for that
alone. One White and one colorless is
reasonable and this is a decent card to have in
your deck.
Play it in Sealed if it fits your colors and
draft it in Booster once the packs start to thin
out a bit and it should serve you well.