one piece card game perona [Japanese] / ペローナ(3rd ANNIVERSARY SET) OP12-034 SR 1 cost tot your opponents during this turn OP14-111 Perona : Rare Alternative

Scholar of the Lost Trove Scholar of the Lost Trove is a whopping 7 mana, but it lets you cast an artifact from your graveyard for free when it ETBs

This was one of the very first ideas for the set, even before we had illustrations, and it came from our creative director, Jess Lanzillo

Take care, and remember never to ignore coincidence

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I think they got to echo because the "pay a fee to keep the card" aspect felt similar to echo