▁most ▁two ▁wild ▁cards ▁rather ▁than ▁three . ▁ ▁M eld s ▁of ▁more ▁than ▁seven ▁cards ▁are ▁strictly ▁forb idden , ▁as ▁are ▁duplicate ▁m eld s ▁of ▁the ▁same ▁rank ▁by ▁the ▁same ▁team . ▁This ▁has ▁a ▁few ▁strateg ic ▁imp lications ; ▁for ▁example , ▁it ▁is ▁impossible ▁to ▁pick ▁up ▁the ▁p ile ▁on ▁the ▁strength ▁of ▁a ▁pair ▁of ▁( say ) ▁j acks ▁in ▁your ▁hand ▁if ▁your ▁team ▁already ▁has ▁a ▁m eld ▁of ▁five ▁j acks , ▁natural ▁or ▁otherwise . ▁ ▁One ▁common ▁exception , ▁is ▁to ▁allow ▁m eld s ▁of ▁ 8 ▁or ▁more ▁cards ▁when ▁going ▁out . ▁Sk illed ▁players ▁will ▁play ▁a ▁wild ▁card ▁on ▁an ▁existing ▁can asta ▁for ▁the ▁win . ▁ ▁Se qu ences ▁( such ▁as ▁those ▁that ▁define ▁S amba , ▁described ▁below ) ▁are ▁not ▁legal ▁m eld s ▁and ▁play ▁no ▁role ▁in ▁the ▁normal ▁play ▁of ▁American ▁Can asta . ▁The ▁closest ▁thing ▁to ▁a ▁sequence ▁that ▁is ▁normally ▁allowed ▁is ▁one ▁of ▁the ▁Special ▁H ands , ▁described ▁below . ▁ ▁M eld s ▁of ▁se vens ▁cannot ▁include ▁wild ▁cards . ▁A ▁can asta ▁of ▁se vens ▁is ▁worth ▁ 2 , 5 0 0 ▁points ▁rather ▁than ▁the ▁usual ▁ 5 0 0 . ▁However , ▁if ▁the ▁hand ▁ends ▁without ▁your ▁team ▁comple ting ▁this ▁can asta , ▁your ▁team ▁los es ▁ 2 , 5 0 0 ▁points . ▁Ret aining ▁three ▁or ▁more ▁se