Jorubai Murk Lurker gets +1/+1 as long as you control a Swamp. : Target creature gains lifelink until end of turn. (Damage dealt by the creature also causes its controller to gain that much life.)
Multiple instances of lifelink on a creature are redundant. Giving the same creature lifelink more than once won’t cause its controller to gain additional life.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.