CDA defining power and toughness have a special sublayer designated for them: Turning to frog will bereave Tarmogoyf of its ability in layer 6, so its ability is not applied in 7a, and in sublayer 7b we get a 1/1 creature without abilities
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Much like its red contemporaries, this card will find a home in typical black strategies like drain and creature decks
Additionally, if your opponent hasn't already popped off with Scute Swarm, it shuts things down before the Swarm can proliferate and become problematic
It has negative counter synergies and its an ETB effect, so you can play it in a deck like Yarok, the Desecrated
(6/16/2023) The phrase "that hasn't been chosen" refers only to that specific Gandalf the Grey