Mako Tsunami's Decks

Duelist Kingdom
During the Duelist Kingdom tournament, Mako used a Deck comprising of sea creatures. He took advantage of the field bonus element of the tournament by Dueling near water to ensure his monsters were hidden under the water field and gained field power bonuses. He had no Magic or Trap Cards shown in his Duels.

Battle City
In the Battle City tournament, Mako relied on the abilities of "Umi", primarily to conceal his monster's identities. He also used cards such as "The Legendary Fisherman" and "Tornado Wall" with his Field Spell Card.