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While you can use level 6 monsters to XYZ summon this card, the more effective way is to summon it using Cyber Dragon Nova as the sole material as that card is a rank 5 XYZ monster and way easier for Cyber Dragons to summon

The name of that river was used as a codename for the 866 MHz Flip Chip Pin Grid Array (FCPGA) Pentium III (P3-850) microprocessor, which was released by Intel

With very few cards that could counter it in the Duel Monsters era, it made sense to ban it

Remember that adding more cards to a deck, increases the population size, which also reduces probability so one must also remove cards after adding