MTGNexus

Previewed here: https://hjgm.net/?p=19618

Approximate translations, due to Dakoval on Reddit:

Venom Troll 3GG
Creature -- Troll (uncommon)
3G: Roll a d20. Activate this ability only if Venom Troll is in your graveyard.
1-9 | Put Venom Troll on top of your library.
10-19 | Return Venom Troll to your hand.
20 | Return Venom Troll to the battlefield tapped.
6/2

Hadar's Messenger 4B
Creature -- Human Warlock (common)
5B: Roll a d20.
1-9 | Each player loses 2 life.
10-19 | Each opponent loses 2 life and you gain 2 life.
20 | Each opponent loses 2 life and you gain 2 life. Create a Treasure token.
4/4