If you play him then hold up counterspells to stop any shenanigans, his Drake army will grow out of control
Goblin Bookie is still commonly seen as a player for coin flipping decks that use stuff like Karplusan Minotaur, Chance Encounter, Krark's Thumb, and Goblin Bomb
If you trade off a Snapcaster early, or pitch one to Force of Will, thats one less way to win left in the deck
Coral Colony This slot should maybe have gone to Phenax, God of Deception, which especially as a commander has a much higher ceiling as a creature-based mill engine
I don't think this booster type is being launched with Bloomburrow by accident - the theme is very child-friendly
Coat of Arms is a popular and widely played card in the format, and Banner is as good if not better