Mako Tsunami

Mako's Mythic Depths skill seems to be the only skill that makes Water-attribute monster (Fish, Sea Serpent, Aqua-type monster) playable in meta competitive. This skill also provides great advantage for deck containing “Levia-Dragon - Daedalus” to activate its field clearing effect, also most of the useful Water-type monster can be obtain from Age of Discovery pack.
→ Daedalus: deck recipe

The only useful card for Water-attribute monster deck that player can receive from level-up rewards is “Water Hazard” (Receive when reach level 25). However it is also possible to obtain that card from dueling him at the gate, so player do not spend too much time grinding his level.

Most of the dueling reward cards that player could obtain from him are only useful to Water deck. The monster obtained from him are not so useful when compared to other Fish-type monster obtained from Age of Discovery pack. Still, it is not a suggestion that players should ignore dueling him, since the difficulty for beating his level 40 deck is not so hard, players could duel him to farm for the skill drop.
→ How to get drop skills

Note: More skills are expected! Report Skill name and details by submitting comments or screenshot at the bottom of the page.

What is level rewards?

Mako Tsunami rewards list

Level	Reward
2	Gem x10
3	Umi
4	Skill: Mythic Depths
5	Deck Slot (Mako)
6	Gem x15
7	The Legendary Fisherman
8	Deck Slot (Mako)
9	Gem x25
10	Lost Blue Breaker
11	Power of Kaishin
12	Gem x35
13	Skill: Draw Sense: WATER
14	Hydro Pressure Cannon
15	Gem x50
16	Umi
17	Gem x60
18	Skull Mariner
19	Gem x75
20	Skill: Balance
21	Power of Kaishin
22	Gem x100
23	Umi
24	Gem x120
25	Water Hazard
26	Gem x150
27	Deck Slot (Mako)
28	Gem x200
29	Gem x250
30	Gem x300
31	Gold x100,000
32	Gem x200
33	Fish and Kicks
34	Gem x250
35	Amphibious Bugroth MK-3
36	UR Jewel x1
37	Gem x200
38	Beautunaful Princess
39	Gem x250
40	Fish Depth Charge

Reward cards are card that You can get as reward for gaining a victory over legend duelists.

Mako Tsunami participates in many tournaments so that he can use the prize money to buy a fishing boat and sail the mighty waves. He masterfully used his Sea Deck to give Yugi and Joey some of the toughest Duels ever. His signature monster "The Legendary Fisherman" unleashes its true strength when it swims out into his "Umi" field.