You need every Godzilla promo (along with the normal-set version of the Godzilla cards, in both foil and non-foil, of course)
Duke Ulder Ravengard Duke Ulder Ravengard is a card youve seen a thousand times
A few practical guidelines: Buy sealed products exclusively from official retailers (Pokmon Center, Target, Walmart, Gamenerdz) or authorized hobby shops
In other words, the best and rarest cards for a Mr House or Caesar deck were already likely to be very expensive - stuff like Ancient Copper Dragon for the former, and Myrel Shield of Argive for the latter
From there, we get into the murkier choices
The clock is really fast, and a turn 4 Dragonlord Atarka is very much still a reality as it was in G/R Devotion even without Elvish Mystic and Nykthos, Shrine to Nyx