Then you can tap her with a green mana to make mana equal to your highest power, and with an X spell Hydra like an 7/7 you have already you now convert one to 7, and drop an 13 with that mana for the next one, draw and then have 13 even more and can win fast with their size or make enough mana to win with stuff like Staff of Possession, Fireball and other stuff
For two mana, you get a Black Sorcery spell that can destroy any creature or enchantment you want, and the only other cost is that you lose life equal to that cards mana cost - thats not a bad thing with Deaths Shadow
The one mana counter for two-drops had fallen out of favor in Modern in recent years after being a staple a decade ago, but currently 40% of the top ten creatures in Modern are two-drops as cards like Drannith Magistrate (planeswalker stamp), Orcish Bowmasters, Amped Raptor, and Ajani, Nacatl Pariah see heavy play
If they do, slappage is happening
The publisher offers a few suggestions to avoid counterfeits
Walking Ballista is just a crazy powerful card in a deck that dumps multiple counters on creatures, but Animars cost reduction pushes it over the top