Rascals' Relay

Enchant creature you control
Whenever enchanted creature would deal
combat damage to another creature, prevent all
combat damage that would be dealt to and by
that creature until end of turn, and attach this
aura to it.
At the beginning of your upkeep, sacrifice
Rascals' Relay. If it has been under each player's
control, each player draws 3 cards and gains
5 life. Otherwise, you draw a card.