Once a creature's training ability has triggered, destroying the other attacking creature or reducing its power won't stop the creature with training from getting a +1/+1 counter
There are also some fun ways of generating your own card advantage as well, like using Golgari Guildmage with Golgari Findbroker to have a repeatable recursion engine
Also, a lot of Abzan players will sideboard out hand disruption in games 2/3 in grindy matchups, favoring threat density that can be topdecked in the midgame
The ability to copy each subsequent spell on the other half is nice, but we already have less convoluted ways to achieve the same resultachieve the same result, and 7 defense is a lot to go through
Total set value $151.37 Cards 160 Most valuable cards in Crown Zenith 1Pikachu$35.29Rare Secret 2Elesa's Sparkle$12.78Rare Ultra 3Radiant Charizard$6.09Radiant Rare 4Friends in Sinnoh$5.62Rare Ultra 5Charizard VSTAR$5.56Rare Holo VSTAR 6Friends in Hisui$5.47Rare Ultra 7Rayquaza VMAX$5.00Rare Holo VMAX 8Rayquaza VMAX$4.66Rare Holo VMAX 9Charizard V$3.32Rare Holo V 10Eevee V$2.98Rare Holo V
While this card's stark color choice makes it one that's likely to divide opinions, its set and rarity support its current price