Editing Power Nine (section)

=== Contract from Below ===
''Discard your hand, ante the top card of your library, and draw 7 cards. Remove contract from below from your deck at the beginning of the game if you're not playing for ante.''

Literally banned from every format not because of its power level but because it incorporates literal gambling into the game. WotC banned it, alongside all other ante cards before the authorities would step in because the game had gambling elements. Ignoring the fact that it adds to your ante, it lets you draw a whole new hand for a single black mana. You are probably not losing if you just drew a whole new hand, and if this card can be built around (like in a storm deck) it is downright unstoppable. But again, since it is an ante card it cannot be legally used in any official format. Since Shandalar is a single-player video game the gambling problem isn't relevant and even then it's on the same defacto ban list as the Power Nine.