Historical Rules · 18 February 2022
Rule 108.5
Official source text from the 18 February 2022 Rules release
Nontraditional Magic cards can’t start the game in any zone other than the command zone (see rule 408). If an effect would bring a nontraditional Magic card other than a dungeon card (see rule 309, “Dungeons”) into the game from outside the game, it doesn’t; that card remains outside the game.