What if Disbelief Papyrus was in Undercards? Along with some other things.

Disbelief Papyrus:

Stats - 6/9/14. Rarity - DT

"Need: Sans is in your Dustpile. Turn end: Use Gaster Blaster on the opponent. \[The Need is to summon *him,* not to summon the Gaster Blaster.\] Dust: Summon Backbone."

Backbone:

Stats - 7/10/0. Rarity - Token

"Erase every monster on the board except Backbone. Delay: Summon Lost Sans. Dust: Summon a silenced Backbone with 3/9/0 stats."

Rock Button:

Stats - 0/1/35. Rarity - Legendary

"Need: Disbelief Papryus is on the board. Magic: Erase Disbelief Papyrus without summoning Backbone. Summon Wheelchair Papyrus."

Wheelchair Papyrus:

Stats - 35/1/0. Rarity - Token

"Dodge (20). Taunt."

Eggdog:

Stats - 4/4/5. Rarity - Rare

"Charge. Taunt. Dust: gives the big sad to opponent because they had to kill dogy"