If the goal is
shock and awe and massive lifeswing via
Lantern Scout, maybe try
Tenacity? It will definitely
catch an opponent off guard in a zombie deck, and it gives the added surprise of +1/+1 and untapping. Now you have 3 "Live the Dream Situations"
1. Just like your described situation, low life, full board, draw, cast, turn everything sideways and confetti rains from the sky.
2. Swing with team in a close combat to try and squeak a few damage through, blocks are set so almost everything trades, slightly to your opponents favor, then
boom,
Tenacity, gain boatloads of life,
decimate your opponents creatures in combat, get extra damage through, leaves your creatures untapped and ready to block your opponent as trumpets belt and an impromptu crowd chants your name.
3. Be tapped out and at a low life total, confident in your ability to clean the game up,
Tenacity in hand with open mana. Your opponent has an
Eldrazi Mimic in play, and drops a
Reality Smasher, a
hush falls over the crowd, mimic copies the Smasher and he swings with double smasher for Lethal. Just then, you cast
Tenacity, crowd gasps, women swoon, and your opponents fragile hold on reality smashes as he collapses to the ground in the fetal position. You block his creatures and take out one of the smashers, leaving enough power to finish him off. As they bring you your crown, you contemplate on the power of instant speed
lifelink / untapping.
Of course, these are just best case