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When your opponent activates a Spell/Trap Card or effect (Quick Effect): You can Tribute 1 other Level/Rank/Link 2 monster

It does cost one mana, and it can eventually grant double strike, but that's stretching all sorts of boundaries and definitions

But thats not all its good for

Vigilance is especially powerful in this deck because being able to attack and block with the same creatures each turn cycle maximizes your chance to trigger her ability

Lower Text [Your Turn] While you have 4 or fewer cards in your hand, all of your Digimon with the [Dark Dragon] or [Evil Dragon] trait gain Security A

Distinguish yourself in combat and your story will be retold for generations