all game changer cards mtg is:gamechanger · Scryfall Magic: The Gathering Search The Best Cards To Add

While Im not sure if it truly makes the cut in cEDH, you could also cast Return the Favor to make your own copy of the enters-the-battlefield ability of Thassas Oracle to win on top of their ability on the stack

Each Collector Booster includes one rare or mythic with extended art, one foil mythic or rare, nine foil commons and uncommons, three special-frame cards (like showcase frames and Gilded foils), and one ancillary card (from a planeswalker deck or Commander deck, typically)

If the token is a copy of a creature whose power and toughness are defined by an ability (usually printed as */* or similar), the token doesn't copy the ability that defines its power and toughness

1 Banisher Priest

Love the artwork on Flash Counter, too