So, how are these abilities powered

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You only need three artifacts in play to enable that, which sounds imminently possible
Combo Sanguine Bond or Defiant Bloodlord with Blood Tribute
To be honest, Im not big enough in either world to help sort out the difference, but in terms of impact, I think Lorcana will become the biggest CCG/TCG product of all time because Disney fans are the most hardcore fans of any entertainment property I have ever met
Electros Bolt, featuring the iconic Spider-Man villain, and Spider-Islanders both have effects that allow players to cast them from the graveyard if they had been discarded during that turn