Put the top card of your deck into your graveyard. If it was put into a graveyard this way, put a [X00/X00] water/darkness Fantasy resonator token into your field, where X is that card's total cost.
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The best stuff always comes when you least expect it.
If the top card of the deck is not put into the graveyard (e.g. if "Barrier Seal" is applying), then no Fantasy resonator token will be put into your field.