all game changer cards mtg is:gamechanger · Scryfall Magic: The Gathering Search Breaking Down the Commander Game-Changers

Love the artwork on Flash Counter, too

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

Finally, we're going to toss two basic lands to better match the deck's mana curve and to add some real bombshells

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

Prison builds love for her because she generates value while locking boards

1 Banisher Priest