Amarant Coral synergizes with pump spells and other ways to modify its power
To preempt a possible answer, yes, there are decks that can draw a billion cards by turn two and take six Prizes (for example, using Electrode-GX to attach a bunch of Reversal Energy and Counter Energy to Alolan Raichu [Unified Minds] and discarding all these Energy to KO multiple Pokmon)
Even in this ultra-expensive, fast, and competitive format, Channel is restricted, only allowing one copy to be played
So far this year, we've received Battle Styles and Shining Fates and now, the third set of the year has just dropped - Chilling Reign
So it works as a bit of a letdown as you play with it
Kill and recursion is a nasty duo here