If you cannot summon Suijin right after a duel starts, it is difficult to win.
How to use the deck
Tribute set a Suijin!
By tributing two Lamb Tokens, Set a Suijin. You cannot perform a summon/flip summon/special summon right after activate Stray Lambs but still can set a monster.
Do Big Wave Small Wave and Tribute Doll work?
Yes they do. But note that If Suijin on your side of the field is special summoned by using cards like Big Wave Small Wave and Tribute Doll, you cannot activate Overwhelm. You have to have a level 7 or higher tribute summoned monster to use it.