These alternate cards give the Pokemon a unique color pattern
Urza's Creations After working through the trauma of Mishra's death, Urza learned how much of a threat Phyrexia still was
Luckily, that really isnt a problem for this archetype
Plus, you can revive the Citadel when an EARTH Machine of yours is destroyed
A large part of group hug decks are incentivizing your opponents into attacking each other rather than you, and The Second Doctor does a fantastic job of that
It doesnt come up that often, but it does come up more often than using Arcane Denial on your own spellusing two cards to get three cards is trading a resource (cards) for the same resource (cards), which makes it not that exciting, while trading between resourcesfrom cards to mana, is more likely to get you something you need