Here are some
GPT-2 generated cards (it was prompted with existing cards)
Witch+4 Cards
Each other player gains a Crown. The next cards you play or play from your graveyard to your library deals 3 damage to its controller. (Crown has a cost.)
Village+5 Cards
Village +7 Cards+4 Action Cards +3 Actions
Lantern+25 Cards
Elvora+1$
Recover a card costing up to 1 or 2$ to play.
In games with this effect, you must choose not to discard a card to play.
HoneyAt the end of your opponent's turn, if you played an Evolving Wilds at end step, target player discards a card. The discarding happens after the player's next play of that turn.
If this is on a creature with an activated ability, target player is not shuffled.
Old Witch+2 Cards
Each other player gains the Curse, and then may trash a curse from his graveyard. (or discard)
Screaming Skull Baron+4 Cards
If any player receives 8 or more card cards
from his deck,
he may only add any one of
those cards to his hand, or discard
up to 4 cards.
Sea King+5 Cards
Shimmering Phoenix+1 Card
When an opponent receives damage equal to or greater than
your amount of damage dealt, you may target 1 other
player in your deck and gain 1 Curse.
BreathEvery other turn player may gain 2 Curse
This card draws 2 Curse to their hand
Every other turn player gains 4 more Curse, if it's higher-than-normal
This card gains 2 cards from your Trash
All Curse cards and players reveal all cards from your Trash, discarding 1 card
The caster may discard 1 card from their hand.
Trickery:[Old Witch] -10 Cards
After this, give your opponent a Curse.
Hunter+4 Cards
Choose a card that you control, or target player sacrifices the card.
Brawler - Action - 4$+2 Cards
Each other player gains a Curse.
Bogorok - Action - 4$+2 Cards
Each other player gains a Curse.
Chalice of the Void - Action - 3$+5 Cards
If your opponent has a Curse on board gain 3x$Cost card that cost 2$ or less, if you don't you gain 8xCurse card.
Infect - Action - 4$+3 Cards
Draw a card.
Infect - Action - 10$+15 Cards
Draw a card.
Infect - Action - 15$+5 Cards
+10 Cards
As the card effects have moved towards being more consistent
Kanai – Action - 10$+3 Cards
You may trash this for +5$. If you don't, gain +7$ (the number of cards that are discarded at once, but not lost.)