Short Fuse

{7},{t}:Deal 10 points of damage to target player, activate this ability only if the target player has less than 10 life points.
If an opponent casts a spell that would allow them to gain control of a creature, Short Fuse must be at least one of the targets. If Short Fuse were to come under the control of another player, other than the player who summoned him, he deals 3 damage to each creature that player controls and FIVE damage to that player.