Competitive Yu-Gi-Oh You need to keep up with the current metagame if you want to play in Yu-Gi-Oh tournaments, which means updating your deck at least every year even though the format never rotates
Phyrexian Fleshgorger can be cast early for a smaller version with its prototype ability, or if you draw it later you can cast it for its full glorious size
WotC is careful to respect the color pie, but they can still make rare exceptions with cards like Chaos Warp, which can target permanent types that red mana normally cannot
If a permanent enters the battlefield tapped, Teferi, Who Slows The Sunset allows you to +1 to untap it for immediate use, while also tapping pesky blockers or denying your opponent their resources
A strong SST version should answer the buyer question immediately, show a route table, separate official facts from market signals, place product/category/wholesale routes early, and give a risk checklist that protects the buyer from bad purchases