Not kept up with all the Magic x Middle-earth news
This can be any kind of counters: +1/+1 counters on creatures, loyalty counters on planeswalkers, even unusual things like time, charge, or doom counters
Its broken, or it isnt interesting because extra care needs to be taken
Karn, Scion of Urza has been falling as well since it seems to be merely a very good card instead of a silly broken mistake like so many people (including myself) assumed it was early in the format
I agree with Laz's point in the OP that Perilous Myr really hits the sweet spot
Madam Mim, Purple Dragon This amethyst card is fire The most purely powerful card in Lorcanas debut set The First Chapter was Maleficent in her Monstrous Dragon form, boasting more raw strength than almost any other card and the ability to instantly banish a character with Dragon Fire