Stealth Card Challenge

The rules are:
The card must be one of two things:

--A card with the subtype Trap that has a cheaper mana cost after an opponent does something specific.
Example: http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=197538

--A card that does not have a mana cost, but enters the battlefield some other way. You can do this using existing keywords (like suspend) or by making your own.
Example 1: http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=134740
Example 2: http://mtgcardsmith.com/view/righteous-sanctity?list=user#.VWHMr2RVhBc
Example 3: http://mtgcardsmith.com/view/unexpected-mishap?list=user#.VWHMwWRVhBc

Comments

This discussion has been closed.