The second factor is that Urshifu has very polarized matchups, with great matchups against some popular decks (Gardevoir, Miraidon, Charizard) and very bad matchups against others (Mew, Snorlax, Roaring Moon)
Tireless Tracker [c]Tireless Tracker[/c] doesnt directly draw you cards, but it creates Clue tokens, which can later be sacrificed for cards, which is almost as good
- It's an Archetype mostly relying on Banishing They Cannot be Normal Summoned or Special Summoned normaly
Additionally, Seasons Past was forced to play Nissas Renewal, certainly because it was mana-hungry, but also because its control game was weak enough that it desperately needed lifegain in the main
It has a x2 weakness to psychic type Pokemon, no resistance type, and a four colorless energy card retreat cost
Speed and preparedness can often make the difference between success and disappointment