One is the classic lack of suitable removal that makes cards like Mother of Runes, Deathrite Shaman and Grim Lavamancer a monumental headache
Convoke works better the more creatures you have, so youll want a token production subtheme since itll ramp your commander and power your convoke spells even further
Magic: The Gathering has been enduring that kind of censorship for a long time
Stalwart Speartail Stalwart Speartail is a much stronger card than our other bottom-tier dinos, but it's an Alchemy-only card, and therefore unavailable to everyone's Pantlaza, Sun-Favored paper Magic deck
Any slower deck like Tron has needed Relic of Progenitus in the past to survive against faster decks like Dredge and Storm nowadays most decks playing Urzas Saga also opt to play a copy of Relic of Progenitus as a tutor target
Plus, it can give you some insight against an opponent who is using one of the starter decks as a base for what they bring to the table against you