I spent a good chunk of two nights organizing all tagged-"card" pictures and including the names and symbols (♠ ♣ ♥ ♦) for all the playing cards and tarot cards I could make out. I have the following suggestions.
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Implications:
playing_card implies card
tarot_card implies card
tarot_card implies tarot
Reasoning: This helps better organize these, I think
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Aliases:
cards aliases to card
tarot_cards aliases to tarot_card
playing_cards aliases to playing_card
Reasoning: Basically, these just turn the plurals into singular. The advantage to this suggestion is that all pictures with cards will appear in one search, regardless of how many cards they actually have in them, instead of some pictures under "card" and some under "cards".
Updated by SnowWolf