Of the three Vecna pieces, The Book of Vile Darkness is the worst stand-alone card, especially in Standard, where we don't have things like shock lands and pain lands to make us lose life during our turn to make Zombie tokens
Angel of Deliverance A repeated exile effect is quite powerful, which makes Angel of Deliverance appealing top-end, though it costs too much for the average deck to just jam
Being able to put 130 damage on board for 1 Fighting on a 1 point Pokmon is freakishly efficient regardless of the downside, and its big weakness of being a Stage 2 can be mitigated by "Rare Candy", meaning the only real issue with "Rampardos" is its Basic form not being searchable with "Pok Ball" due to being a Trainer Card
People badly overreact to Larceny, which is great fun for you
It always works better in decks that either don't care about their graveyard, or which are throwing cards in there left and right