They will move directly from the end of combat step of one combat phase to the beginning of combat step of the next one
Dropping this on turn 2 is very real with a mana dork start, and suddenly by turn 3, youre already threatening to bring a powerful reanimation target back to life
Deadpool, Trading Card can be used to swap text boxes, then The Master, Multiplied stops the legends rule from applying, meaning the cards don't go in the graveyard
Because of his prevalence and strength, its become standard to only play locations with will power enough to withstand an attack from him
After all, this is the unofficial Redwall Magic: The Gathering set (I mean, have you seen Arthur, Marigold Night?)
Starting with Theros: Beyond Death in January 2020, Wizards started putting cards from these Commander sets in the main set's Collector or Set boosters