500 years in the future one piece booster box BANDAI where the Straw Hat Pirates meet the brilliant scientist Vegapunk BOOSTER PACK - 500 YEARS

And sure enough, the Teenage Mutant Ninja Turtles set had one: Rat King, Verminister

This was mostly due to the constant stream of pressure that Despoiler of Souls put on my opponent

Being able to pay three mana to cast anything from the graveyard for a turn essentially translates to drawing a huge number of cards at a very low cost, but without the randomness that comes with actually drawing the cards

Instant ramp: Growth Spiral, Harrow, Omen of the Hunt, etc, Sorcery ramp: Into the North, Cultivate, Natures Lore, etc

( Update: Ravensburger has confirmed that Disney Lorcana's release date won't be affected by the recent Upper Deck lawsuit.)