Maybe worldbuilding says theyre making a bunny rabbit character, so we as game designers try to think up a card mechanic that feels like something a rabbit would do. Bottom-up, on the other hand, starts from a mechanical perspective
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The first ability harkens back to one of the best creatures ever printed, Dark Confidant
"I was putting my card on the table and shouting [...] and I wanted to see it come out, but it didn't work." In the anime, the creatures contained within each card appear, life-size, on a board in front of the characters
Humans and cycling were two great examples of previous mechanics that let you use old and new cards
Rebuilding around the top end chase cards gets expensive in a hurry, but the good news is that the format is stacked with cheap, proven role players