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Nico Robin (OP16-092) brings Blue/Yellow cross-set flexibility to the Yellow pool, providing on-play effects that support both the Trigger density requirement and the Straw Hat character package

This decision is usually made via a coin or dice roll

That will depend on the board state, of course

You need a spell or ability that instructs you to sacrifice, or uses sacrifice as a cost

The first release came out with just 36 cards (part 2 onwards had 151 for this generation (excluding the 2018 reprint)), so it wasnt a very weighty release and only developed into a massive, branded product line, over time (which it now is: with more than 300 million units sold over its lifespan (Japan has 126 million citizens))