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For his Boss Battle, see Sans: Boss. Effect updates and description changes can be seen here. There are a lot of them. And previous versions of the Gaster Blaster can be found here.
Undertale OST - Megalovania Extended

Undertale OST - Megalovania Extended

0:16-0:23

Since Beta 49.1, Sans has Dodge (3), which lets him avoid taking any amount of DMG 3 times. It only counts if he actually would take damage, so 0 ATK monsters won't trigger it. This number will reset if the monster is returned the player's hand or deck, similar to the lives of The Heroine. He also has the ability to give Gaster Blasters, just like Gaster himself (until Beta 46.0), but gives them with their cost reduced by 2G. Sans adds one of them to your hand at the start of your turn, but also when you play him from your hand.

As of Beta 37.0, the Gaster Blasters themselves cost 6G to use to deal 8 DMG to any monster of your choice. The Blasters Sans gives are reduced to 4G. Using Science reduces the cost of Sans' Blasters even further to 3G (while also providing with 5 5G Blasters itself).

Strategies

As stated before, Science reduces the cost of any Gaster Blaster you have, thus Sans is a great addition to one. Sans can also work in a Scepter deck, as each Blaster will trigger the Artifact.

Counters

Countering Sans is fairly easy. You can simply Silence Sans with Scarf Mouse or Nacarat Jester, use cards that do X times 1 damage, such as Undyne or Undyne's Spears or place a card that will instantly kill Sans, such as Muffet's Pet (if it wasn´t ATK boosted), Knife or Headshot. As you can see, Sans is best countered with the Justice SOUL.

Card Skins

Card Skin (Sans)

Get Dunked On

  • Get Dunked On (by Darky)
    Card Skin (Sans) 2

    So Cool

  • So Cool (by Moonlightring)
    Card Skin (Sans) 3

    Angry Sans

  • Angry Sans (by Moonlightring)
    Card Skin (Sans) 4

    Mini Rider Sans and Kawaii Gaster Blaster

  • Mini Rider Sans (by BlueKitty12)
    • Kawaii Gaster Blaster (sold separately)
      Card Skin (Sans) 5

      Final Attack

  • Final Attack (by Jeffa Pegas)
    Card Skin (Sans) 6

    Ketchup Sans

  • Ketchup Sans (by Jacky Bunny - Fan Artist)
    • Only available through Pass Quests.
      Card Skin (Sans) 7

      A Welcoming Smile and Blaster Power

  • A Welcoming Smile (by Diamaincrah)
    • Blaster Power (sold seperately)
      Card Skin (Sans) 8

      Furry Sans

  • Furry Sans (by Diamaincrah)

Trivia

  • Just like any other card, a Shiny Sans gives Shiny Blasters.
  • Sans's cost drop to 7G in Beta 10.2 wasn't listed in the Patch Notes
  • Sans is the First boss ever featured in Undercards, and uses the Ketchup Sans skin in battle.
  • Sans is the First card to be both DT and Legendary. (DT is Bad Time Boss Sans)
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