Pulling a premium Pixar card and raw-dogging it through three rounds is how villains are made
Exile has become one of the most sought-after effect for control players to harness
Tromell, Seymours Butler* I dont really remember Tromell, but this card is a good fit for +1/+1 counter decks, especially for those that want to go wide, and in elf-ball decks
Still, once it resolves, you can choose how to kill your opponent slowly by either casting spells from the top of their library without paying mana, shrinking their hand, killing their creatures, and, if they've survived long enough, exiling all their non-land permanents with the ultimate
Y'shtola also synergizes well with common Black and White deck themes that focus on dealing small damage and healing outside of the player's combat