He has reasonable in built synergy and fairly unusually a really strong ultimate
He was especially good at punishing players relying on sweepers, both in dodging them and in how quickly he goes ultimate, creating an inevitability thats extremely hard to race
This tier is ideal if you care about having a visually stunning collection but dont want to pay the steep premium for perfection
Also, it doubles your landfall triggers
(2023-06-16) The trigger event doesn't have to specifically refer to legendary permanents or to artifacts, nor does it have to specifically refer to when something "leaves the battlefield." For example, an ability that triggers "whenever a creature dies" would trigger twice if a legendary creature or an artifact creature dies while Gandalf the White is on the battlefield, as would an ability that triggers "whenever a permanent is put into a graveyard from the battlefield." (2023-06-16) Look at each legendary permanent and each artifact as it exists on the battlefield, taking into account continuous effects, to determine whether any triggered abilities will trigger multiple times
Erika is a niche Supporter best suited for Grass-Type decks