Summer
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About this card
Summer or summertime is the hottest and brightest of the four temperate seasons, occurring after spring and before autumn. At or centred on the summer solstice, daylight hours are the longest and darkness hours are the shortest, with day length decreasing as the season progresses after the solstice. The earliest sunrises and latest sunsets also occur near the date of the solstice. The date of the beginning of summer varies according to definition, climate, tradition, and culture. When it is summer in the Northern Hemisphere, it is winter in the Southern Hemisphere, and vice versa.
Summary from Wikipedia (CC BY-SA 4.0).
Spell Card
Field
Once per turn: You can place Season Counters on this card equal to the number of your opponent's unused Main Monster Zones. Once per turn, when your monster declares an attack: You can inflict 400 damage to your opponent for each Season Counter on this card, and for each "Spring" in your GY. Once per turn, during your opponent's End Phase: You can take 1 Field Spell from your hand or Deck that you can place a Season Counter on, and place it face-up on your field (but neither player can activate its effects this turn), and if you do, place all Season Counters on this card on that card.
Data via YGOPRODeck.