Other cards have similar effects, like Tidal Barracuda giving it to the entire table, but starting the game with a Leyline of Anticipation out is an incredible way to get way ahead of the game
Emrakul and Chatterfang For a long time, Magic players have joked that Emrakul cant be that strong if she can be beat by 15 squirrels
Restricting your deck to only mono-blue spells removes options, but you can funnel all that mana into blue card draw spells to trigger the likes of Psychosis Crawler and Ominous Seas to bury your opponents in card advantage, damage, and triggers
For a Bracket 3 build, Id be looking to curve out with value creatures that have strong mana and card generating ability, combined with strong attack triggers that Aurelia can come along and double up on
The deck's play pattern starts simple: use your elves, moles, or spider avatars to ramp into an Ouroboroid, then let your opponent sweat while it grows your board at a frightening rate