Seath the Scaleless

When you cast Seath, the Scaleless, you may
look at the top X cards of your library, where X
is the number of legendary creatures in your graveyard. If you do, you may reveal an artifact, instant or sorcery spell from them; add it to
your hand, then put the rest on the bottom of
your library in any order.
{t},{w}: Seath the Scaleless gains indestructible
until the end of turn. Activate only if you control
an artifact.