I did this tally by searching on Scryfall with a year:20xy query (which provides all cards printed that year) do note that for 2023, we only have partial results: So, Fact #1 : Card output started to ramp up in 2019, saw a huge spike in 2022, and by August 2023 we've already seen more cards than any whole year prior to 2019
That might not sound like a ton of fun, but in this card's defense, it rewards you for putting counters on stuff in a way that ends the game through trigger damage rather than forcing you to attack like some color combinations that don't have access to Red
Usually, mechanics that target cards outside of the game refer to your sideboard or cards exiled by the same spell like with Karn, Scion of Urza
This 5/5 stops opponents from gaining life, has Menace, and turns the mana cost of every first spell of a players turn into damage against another player