Mage: Change Tortollan Pilgrim so that it casts the spell from the deck (removing it from the deck in the process) instead of casting a copy.
Combined with Potion of Illusion and Frost Nova, Tortollan Pilgrim makes the game 100% uninteractable for the opponent. It's not just that it's powerful. It's not just that it's annoying. It's that it makes the game literally unplayable for one of the players, and at that point it ceases to be a game. You can either concede or wait for the inevitable, but either way, you're not going to get a chance to play the game anymore that match. And that just feels lousy.
Pilgrim + Potion is a cool interaction, and sets you up to cheat some more mana. That's fine. But infinite Pilgrim + infinite Potion is bad for the game.
If Tortollan would remove from deck so should all other cards like Druid Guardian Spell with rush remove the minnions from deck.