Community

117.12. Some spells, activated abilities, and triggered abilities read, “[Do something]. If [a player] [does or doesn’t], [effect].” or “[A player] may [do something]. If [that player] [does or doesn’t], [effect].” The action [do something] is a cost, paid when the spell or ability resolves. The “If [a player] [does or doesn’t]” clause checks whether the player chose to pay an optional cost or started to pay a mandatory cost, regardless of what events actually occurred.

117.12a Some spells, activated abilities, and triggered abilities read, “[Do something] unless you [do something else].” This means the same thing as “You may [do something else]. If you don’t, [do something].”

Aug 29, 2012 -- 2:28PM, Nylon wrote:

Aug 29, 2012 -- 12:34PM, PirateAmmo wrote:

In is an effect. It is the effect of the resolving spell Wrench Mind .

That's correct. Anything that happens as a result of a resolving spell or ability is an effect. Even if it also happens to be a cost.

The ruling of Library of Leng disagree with you.

You can't use the Library of Leng ability to place a discarded card on top of your library when you discard a card as a cost, because costs aren't effects.