Instead of stating that you can cast the creature once from outside the game, the new rules state, "...you may put it into your hand from outside the game for 3 as a sorcery." Thus, instead of directly casting this creature from the Companion Zone, you first need to pay three generic mana to bring the creature into your hand
It definitely reminds me of the nasty dessert your aunt would bring to dinner that no one wanted to touch
It's Birgi herself that's exciting, thanks to her granting you one red mana whenever you cast a spell
Placing an enlightened counter on Faceless Haven, and then never animating the land for the rest of the game, makes it nearly impossible for an opponent to win the game
On top of that, you want your cards to be impactful if youre planning on playing the long game, so youll need some high-cost, high-impact cards to close the game out when youre ready
This corresponds to Chaos-End Master, etc., but the Synchro Monster whose material is Plant is only at level 6