Naughty or Nice

Split Second and Dual Cast (You may discard
this card to return another instant or sorcery
card with an equal or lower mana cost)
Only cast after an opponent has declared their attackers. They may undeclare attackers, for each creature still attacking, the defender gains 2 life.
If no creatures attack both players draw a card.
"Why, changing from bad to good is as easy as...
Taking your first steps" ~The Winter Warlock