Behemoth Sledge
Artifact — Equipment
Equipped creature gets +2/+2 and has trample and lifelink.
Equip 
A crudely reinforced baseball bat. Designed to beat the living tar out of anything and everything.
Nakamura8
Rulings
Multiple instances of lifelink on the same creature are redundant. If a creature with multiple instances of lifelink deals damage, its controller still only gains life equal to the damage dealt.
(wotc • 2009-10-01)
Rulings
Multiple instances of lifelink on the same creature are redundant. If a creature with multiple instances of lifelink deals damage, its controller still only gains life equal to the damage dealt.
(wotc • 2009-10-01)