Either way, it introduces a lot of variability in Trainer cards, which is a welcome thing
While Daretti's variable attack means you can attack to win with commander damage, his real draw is his second ability: When Daretti, Rocketeer Engineer enters or attacks, you can sacrifice an artifact to bring another artifact into play from your graveyard
Additionally, the metagame is bound to shift as new sets are released
Its All-out Blast attack is one of the wildest in the TCG: you discard cards from your deck until theres only one left, and it deals 20 more damage for every Energy you toss
, 400%
Attacks require energy cards in order to use, whereas abilities are either passive effects on the battlefield or can be activated during your turn, depending on the text of the card