These cards often feature fan-favorite mons with dynamic designs, so theyre worth having as a collector.
Once per battle, during damage calculation, if this card battles a Special Summoned monster (Quick Effect): You can make this card gain ATK equal to that opponent's monster's ATK during that damage calculation only
We've seen abilities like it before on cards like Gnarlid Colony, but having it as an enchantment that also gives the counters needed to enable it push it up to a potential green stample for a good while to come
The biggest differences come down to language, color, and price
(Equipment, Auras you control, and counters are modifications.) If Ian the Reckless isn't modified when it attacks, its ability won't trigger at all