Once per turn: You can banish 1 Plant-Type monster from your Graveyard, then target 1 Defense Position monster your opponent controls
There are more and more creatures with abilities in modern sets, and WotC is continually pushing design space on cards
Historically, Stage 2 Pokmon (Other than Gardevoir and Charizard, who had its own acceleration mechanic) had really struggled to keep up with the game but adding a single copy of Rosa can truly make the difference in decks like Garchomp ex or Dragapult ex, allowing them to have a much stronger late game
This green cantrip fills the graveyard and puts a body on board that ramps you into a 4-drop a turn early
[3] During the Main Phase: You can add 1 "K9" Spell/Trap from your Deck to your hand
Combine Rockstar with other high-value Stitch cards like Carefree Surfer to take advantage of its Shift ability, and you've got a win-win- win