mtg cards with reconfigure MTGNexus While attached Lion Sash MTG - Kamigawa:

An ability that triggers when a creature becomes the target of a spell resolves before the spell that caused it to trigger

The trap here is playing him too early with an empty yard

Its got a good rate and it looks like something worth doing, but contextually there are a lot of exile effects that bypass the ability (Silkwrap, Abzan Charm, etc)

Teysa Karlov I place Teysa Karlov in the #1 spot today thanks to its extremely powerful ability to double your triggered abilities

As I write this, the cards of Coldsnap have recently been revealed, which includes a card that can create a token that weighs in at an astounding 20/20, making it bigger than George Foreman and all of his kids combined

See how they work together to keep your stuff hitting your graveyard and then the once/turn cast