Charizard has quite a few different printings in Obsidian Flames, and there's something special about the ultra rare one
If you have just three, then four mana makes four 1/1s for everyone, and then one removal spell that kills them all will net 12 treasures for yourself, and you are ready to go
Mana Vault You cant fool me
Whether in your hand or already on the field, you can just pump it up until it has enough counters to remove and kill your opponents at instant speed
And this doesn't even include the free dig spell Once Upon a Time, the endless Zombies from Field of the Dead, or the annoying loops generated by Mystic Sanctuary

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