It untaps them well, and it untaps them often
Rarity: 4 Diamonds Charizard ex is one of the best decks in the physical Pokmon Trading Card Game , and TCG Pocket is quite similar, as Charizard ex functions differently but is still quite strong
And, to a lesser extent, also in Blech, Loafing Pest decks
Some events, like Pokmons League Challenges, even let you earn points that could qualify you for bigger competitions like the World Championships
Soulherder is quite powerful, but is also quite fragile
Also, those effects are cumulative, so at 40 you actually get to draw a card, untap all your creatures, and each opponent loses half their life rounded up