Snapcaster Mage (Regional PTQ) [Pro Tour Promos] SM131 Could it be that the

Could it be that the trees of Fangorn were awake

This effect can't reduce the mana in that cost to less than one mana

creating a massive temporal reaction

then copy all other activated and triggered abilities you control

Snapcaster Mage (Regional PTQ) [Pro Tour Promos] SM131 Could it be that theSet: Pro Tour Promos Type: Creature Human Wizard Rarity: Mythic Cost: {1}{U} Flash When Snapcaster Mage enters the battlefield, target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost. (You may cast that card from your graveyard for its flashback cost. Then exile it.)