one piece extra booster box EB-02 Anime 25th Collection Pack (Japanese) EB‐03 introduces a new leader card One Piece Card Game -

I might not have all the mechanics down, and Im still misreading what some spells do, but Magic: The Gathering Arena has this way of teaching you without discouraging you

Retrieved March 9, 2016

If you cast a spell "without paying its mana cost", you can't choose to cast it for any alternative costs

Here's the card turned in from design: Boss Scragnoth 5G Creature Beast 4/4 While in your hand, CARDNAME cannot be discarded

With its inclusion in WOC, well see that price drop, and even more players will fall into the trap that blue artifact players have known to sidestep since the days of Mindslaver and Academy Ruins