When Master Splicer enters the battlefield, create a 3/3 colorless Golem artifact creature token.
Golem creatures you control get +1/+1.
3/14/2017 If a creature has been dealt damage, that damage remains marked on it until the cleanup step. If Master Splicer leaves the battlefield and a Golem creature you control has been dealt damage, that creature will be destroyed if the damage is now lethal. Similarly, if that causes a Golem to have 0 toughness, it’s put into its owner’s graveyard.