If I have {heartless summoning} up and I play {ambush viper} does it go to the graveyard before or after it deals one deathtouch (effectively killing) dam to the creature it's blocking with flash?
Before it deals the damage. Once it enters the BF it gets -1/-1 and therefore it's toughness is reduced to zero so it dies and is sent to the GY.
Darn, thanks anyway.