Solitary Camel has lifelink as long as you control a Desert or there is a Desert card in your graveyard. (Damage dealt by this creature also causes you to gain that much life.)
If an ability checks whether you control a Desert or there is a Desert card in your graveyard, having more than one doesn’t matter. Controlling one is the same as controlling five. There is also no extra bonus for both controlling one and having one in your graveyard.
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.