Back in the day, I used to make a puzzle column, called Magic : The Puzzling, that often exploited this quirky weirdness in the rules
like Actions and Items, these Song cards can be played immediately
The reason is that Izzet Prowess can end the game in 4-5 turns, so the benefit of adding counters isn't fully utilized, and if the game continues beyond that, this card would likely have been removed already
Illustrated by Peter Polach Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Legal Comp
This will certainly grow, but starting out as a 2/1 is brutal, and you need two counters to feel like you're getting there
From the very beginning, spells that kill creatures have been more efficient than the creatures they're killing