There are plenty of discard synergy pieces in Red that make all our discarding even more powerful: we have plenty more ways to turn our cycling / looting into card advantage with Containment Construct, Conspiracy Theorist, Bag of Holding, Currency Converter, and Veronica, Dissident Scribe
Fiend Hunter and Palace Jailer are the clearest examples of solid, budget-friendly removal that's good for flickering, but most of the others aren't great as they're more in the vein of the temporary Banisher Priest
FC - Bite 30 Regigigas Ability: Ancient Knowledge If you have Regirock, Regice, Registeel, Regieleki and Regidrago in play, once during your turn you may attach up to 3 Energy from your discard to 1 of your Pokemon
Dust off the obscure Mishras Groundbreaker to do the same with a land
What are Trade Tokens in Pokemon TCG Pocket
This is why a Trap Card such as Fiend Griefing can become quite dangerous, as this Common Card not only brings back a card from the opponents GY back into its deck, it also sends a Fiend monster of the players deck into the GY