Scarecrow essentially allowed the deck to consistently combo off a single Superheavy Samurai Monster simply by Link Summoning into it and extending with its own effect
When Haga threw Yugi's "Exodia" cards overboard, Jonouchi dived into the water, but only managed to retrieve two of them
Fab Lyrr will most likely start off by playing Riroku (power-up that uses half of your LP to power up his monster) and a Skull Knight or something similar with over 2000 ATK
Another issue with Looter is that the discard is in the combat step which makes it weaker for Shallow Grave style cards
You must also track how each became face down (Magar's ability, cast face down using the morph ability, and so on)
Cayth, Famed Mechanist Cayth, Famed Mechanist may seem like the odd one out in this list, but shes deceptively useful in an energy-based Commander deck