Toxic Deluge is your go-to board wipe
It is true that a fetch into a shock land sequence can cost up to three life every time, you have to remember that losing the game because you couldn't cast your spells on tempo will feel worse every time
Luckily, despite their high costs in near-mint (NM) condition, you can find much better deals if you look at lightly played (LP), moderately played (MP) or heavily played (HP) copies of these Dragonite cards
Then theres Fractured Sanity, a three-mana Blue sorcery that has each opponent mill 14 cards (discarding from their deck to their graveyard), but can also be cycled to draw a card and make opponents mill four cards instead
It will likely start in the sideboard, and could become maindeckable depending on how popular aggressive decks are in the metagame
Legality depends on the tournament format -- Reflective Rimekin can be legal in some formats and banned or restricted in others