So long as you have plenty of sacrifice fodder (easily provided by token generators like Bitterblossom and Jadar, Ghoulcaller of Nephalia), you get an extra card and a bit of damage each turn
Sprout Swarm is arguably one of your strongest cards for this deck, as it can singlehandedly raise a Saproling army at instant speed
If multiple cards are put into the library this way (such as when the spell targets a melded permanent), that spell or permanent's owner puts all the cards on top or all the cards on the bottom
Players likely wont take issue with new art on a regular Magic cardfor example, if you put a picture of your cat onto Arahbo, Roar of the Worldyoure fine
I hope you enjoyed our little exploration of these special cards
Some are removal spells and some, like Venerated Rotpriest are bombs