So, casting it means game over
Many decks tried to smooth out their mana curves in order to try and make Void less devastating, but there always seemed to be a good number to choose, and the existence of quality bounce spells Repulse and Recoil meant you often had a decent read on their hand even if you hadn't looked at it directly and also made it much easier to leave them with multiple cards in the same casting cost and not take damage while building up to five
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Mana rocks and other ramp elements go a long way
Rayquaza's unique position as one of the most expensive Pokemon ever makes it a likely choice to remain as the most expensive card from this era for the foreseeable future
While the fact that it self-destructs is a concern, it might be similar to "Loyal Apprentice" in terms of usability, as you can cast Tymna the turn after it lands and attack immediately