Put your choice of a vigilance counter, a reach counter, or a trample counter on it
Multiply that by a dozen spells or so, and you'll have a game-winning situation
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They must leave the creature unblocked, or assign at least two blockers
If you thought treasures were powerful before, just think how much better they are when you dont have to sacrifice them for mana
Naturally, while the activated ability is on the stack, the opponent may counter it with something like Disallow, then the effect will not be created