This is based purely off of my experience in Commander, Im just someone who loves playing the format, not a deckbuilding expert
It can trigger on-death effects easily, giving you those effects while also ramping you with Treasure tokens
If the spell has any targets, you may choose new targets for any of the copies." As the replicate triggered ability resolves, you'll copy Shattering Spree for each time you paid its replicate cost, even if the original spell is no longer on the stack at that time (perhaps because it was countered)
You may also want to include the new Titania, Voice of Gaea and Argoth, Sanctum of Nature
Gogo is a four mana red card that Im very happy to play, especially in decks that revolve around big haymakers like Etali, Primal Storm
Well, The Elderspell is one of the bits of removal going, but its also very specific