The answer isnt as straightforward as that of the riddle Oedipus solved, but I like how it gives this Sphinx an adventurous tinge
You can either make a 2/2 White Cat Beast token, which is nice but not what were going for, or you can put a +1/+1 counter on each Creature you control and then those Creatures gain vigilance until end of turn

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This collectibility aspect encourages players to trade, purchase, and hunt for these cards, adding a treasure-hunt dimension to the Pokmon TCG experience
The only drawback to this card is that you can only play Mela if you had a Pokemon get knocked out during your opponents last turn
The creature part is kind of whatever but I'll take it