You can't choose to put the creature card into your hand if its mana value is less than or equal to the number of experience counters you have as the ability resolves
In tournament play, where a round is decided by a best-two-out-of-three, you can also bring a separate Side Deck of up to 15 cards to swap in between duels to adapt to your opponents specific deck
(6/6/2025) If a land or Bird you control entering at the same time as Traveling Chocobo (including Traveling Chocobo itself) causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time
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With ruby excelling in cards built around aggressive challenges, it can even the odds in an outmatched fight against a bigger opponent - or simply make a stocky character even more of a threat