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The opportunity to play your own one-drop spell and then shut down your opponents with free counterspells is already borderline too-good with more significant drawbacks

If you need to protect your other Aqua monsters (specially Toad)

Voyaging Satyr + Sculptor of Winter Voyaging Satyr and the slightly harder to use Sculptor of Winter are totally fine mana dorks that are particularly handy in enchantress decks loaded down with aura-based ramp la Utopia Sprawl

GameStop in the US has its Power Packs, Total Cards in the UK has Mystery Card Bundles, and in Japan you'll find the origins of the practice: the Oripa (Original Pack)

When you finish dueling him he should tell you where Mokuba is