Sultai Mutate likely would have scored much better if it were Sultai X-Matters instead, with Zaxara, the Exemplary as the face Commander and the underpowered and unexciting Otrimi, the Ever-Playful as a backup commander along with a light mutate sub-theme for players who want to build a mutate Commander deck with new Ikoria cards
Sacrifice does destroy indestructible creatures
On top of that, Bloomburrow also gave us Overprotect, which adds Hexproof and Indestructible on top of Trample for no extra mana cost
I love the story of this card because he's so fearsome in the art, but what he does in the game is [run away]...This is a great example of combining the character [lore] with a fun card, Ryan Miller Kim adds that Rexs card also features Woody and Buzz glimmers in the background, protected by their fearsome Bodyguard
Goblin Guide [Extremely Fast and Early Pressure] Most red decks thrive on aggression, and Goblin Guide is one of the strongest red creatures in MTG for that purpose