Rat King, Verminister is a rare Legendary Creature — Rat Avatar card from Teenage Mutant Ninja Turtles (TMT), collector number 266. Current market price: $1.82 (foil $1.84), TCGplayer market prices via Scryfall.
Disappear — At the beginning of your end step, if a permanent left the battlefield under your control this turn, create a 1/1 black Rat creature token and put a +1/+1 counter on Rat King. {T}, Sacrifice three Rats: Return target creature card and all other cards with the same name as that card from your graveyard to the battlefield tapped.