It was already a top-tier contender before Foundations , but with the addition of Llanowar Elves, it now represents a commanding 13.3% of the winner's metagame
You choose the target card in your graveyard as Daretti's second ability is put on the stack, but you don't choose whether to sacrifice an artifact or which one to sacrifice until the ability resolves
Since this ability checks the mana spent and not the mana value, those synergies are off the table
Several examples of typical black cards include Fukurou from Pillars of Strength [OP-03] which cant be KOd by effects, Kuzan from Paramount War [OP-02] which enables the player to draw a card when played before reducing the cost of an opponents Character by 4 during that turn, and Hina from the same set which when on block, allows the player to select any of the opponents Characters with a cost of 6 or less and prevent that opposing Character from attacking during that turn
James: I believe just cards, and possibly some tokens to track certain moves or Pokmon status effects
