Not only can you hold up countermagic to freeze the boardstate, but you can sink excess mana into scry effects, immediately increasing the power of your board rather than needing to first spend a turn drawing cards, then casting them and then eventually being able to attack
Illustrated by Mark Tedin Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Legal Brawl Not Legal Legacy Legal Comp
Each spell cast this way costs more to cast
There are better protection spells, there are better combat tricks, and there are better Equipment
Being able to draw a bunch of cards means youll consistently be getting Illusions on your field, which you can then use to cheat some powerful permanents onto the field
Let me know in the comments, or over on Draftsims Twitter/X