Spell Blast Tutor

[Nydaeli]

Card Name
 
Instant
Counter target spell with converted mana cost X.  Search your library for a card with converted mana cost equal to the countered spell's converted mana cost, then shuffle your library and put that card on top of it.

It's a twist on the Flexible Tutor idea from a while back.  Its reactive nature hopefully means that it'll be a bit harder to abuse.  I'm not sure it's good enough for Vintage, though paying three mana to counter Brainstorm and grab a Recall is a pretty good exchange.  It doesn't seem absurd though.

Maybe I should tack on "You lose X life" to the end of it.

Card Name
 
Instant
Counter target spell with converted mana cost X.  Search your library for a card with converted mana cost X, reveal it, then shuffle your library and put that card on top of it.

[Titanium Dragon]

Card Name
 
Instant
Counter target spell with converted mana cost X.  Search your library for a card with converted mana cost equal to the countered spell's converted mana cost, then shuffle your library and put that card on top of it.

It's a twist on the Flexible Tutor idea from a while back.  Its reactive nature hopefully means that it'll be a bit harder to abuse.  I'm not sure it's good enough for Vintage, though paying three mana to counter Brainstorm and grab a Recall is a pretty good exchange.  It doesn't seem absurd though.

Maybe I should tack on "You lose X life" to the end of it.

Why not just:

Counter target spell with converted mana cost X. Search your library for a card with converted mana cost X, reveal it, then shuffle your library and put that card on top of it.

It doesn't need to be "the countered card's converted mana cost"; that adds needless complication. It won't resolve without a legal target, so it doesn't really matter anyway.

[oneofchaos]

Should it be X or less?

[Nydaeli]

Counter target spell with converted mana cost X. Search your library for a card with converted mana cost X, reveal it, then shuffle your library and put that card on top of it.

Sure.  The original wording is nice because it implies a stronger connection between the two actions, but it's nice to pare down the word count a little.  Also, I forgot to include the "reveal it" clause which is obviously necessary.

Should it be X or less?

I don't think so.  I want this to be a reactive tutor that is dependent on what the opponent plays, not a random Vampiric Tutor tacked onto a counterspell.