I tried so many decks before I managed to do this.
The easiest way I found was using Pegasus and his toon decks. Any 4* toon mon will do with 2k or more atk. Use his toon world skil, Summon any 4* toon Mon with 2k+ at and add a couple of toon rollback cards to the deck. You can summon turn 1 and attack twice their LP directly on turn 3.
It only took me 3 attempts to get both quick victories.
Discard brionac > seach for clausolas
Discard clausolas > search for nekroz cycle
Activate nekroz cycle to SS brionac from the GY
Tribute either shurit or benten for that
Search another ritual
This card will be hard to beat except for a negate. mst or destroying or bouncing the ritual summoned monster cannot stop this from resolving it just need that recquirment to activate.
There's no search in that deck. Genex Undine or Buzzsaw Shark targeting a level 7 Mermail are the two best ways to search Citadel Whale. Nimble Sunfish is ok.
