Once per turn, when a monster(s) on the field is destroyed by battle or by card effect: You can Special Summon Level 4 or lower "lswarm" monsters from your Deck in Defense Position, up to the number destroyed
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Its worth noting that making an opponent discard or exile a card from their hand are slightly different effects
It's amazing that you can destroy up to 2400 monsters by itself
General rules for stickers: The four types of stickers are name stickers (which add to a card's name), art stickers (which add to a card's art), ability stickers (which add to a card's abilities), and power and toughness stickers (which set a card's base power and toughness)
(So thank you, Notch, for making me a cool dad, if only for one night.) When we chose to do this promotion, one of the things we decided was to allow the outside designers a little more latitude when designing their cards