I strongly believe that going below a playset of each has to be backed up by very good arguments, but other than that, its probably wrong to do so
The opponent can of course choose to reverse the burn by flipping a coin but will have to suffer an additional 20 damage, as the rules regarding burns have changed since the Sun & Moon expansion
If you discarded a Pokmon, this attack does damage equal to the HP of that Pokmon
You still get a free copy every turn, but you can keep casting other cards
This artifact is on the expensive side at six mana, so keep that in mind when building your next deck
This version of Gyarados takes the shiny red form, exceptionally rare under most circumstances, and turns it into a Basic Pokemon, much like an ex Pokemon