Wick, the Whorled Mind | Legendary Creature | Rat Warlock | Whenever Wick or another Rat you control enters, create a 1/1 black Snail creature token if you don't control a Snail. Otherwise, put a +1/+1 counter on a Snail you control.
{U}{B}{R}, Sacrifice a Snail: Wick deals damage equal to the sacrificed creature's power to each opponent. Then draw cards equal to the sacrificed creature's power. | Andrea Piparo
4.5 LSV
Mind Drill Assailant | Creature | Rat Warlock | Threshold — As long as seven or more cards are in your graveyard, Mind Drill Assailant gets +3/+0.
{2}{U/B}: Surveil 1. (Look at the top card of your library. You may put it into your graveyard.) | Tuan Duong Chu
2 LSV
Vren, the Relentless | Legendary Creature | Rat Rogue | Ward {2}
If a creature an opponent controls would die, exile it instead.
At the beginning of each end step, create X 1/1 black Rat creature tokens with "This creature gets +1/+1 for each other Rat you control," where X is the number of creatures your opponents controlled that were exiled this turn. | Kevin Sidharta
4.5 LSV