4 damage can kill a lot of utility creatures and several planeswalkers, but when done two or three times, potentially in a turn, it can kill almost any and everything
Much like the Articuno and Starmie deck structures, Lapras follows this same format, including double copies of Lapras ex for your basic Pokemon, and the rest of the deck being compiled of Support/Trainer/Item cards, such as Misty and Poke Ball
Furthermore, it is often difficult to recover from a board state without any energy on it
1 Idyllic Tutor
This Psychic-type gets stronger the more cards your opponent has in their hand, though it is not its main selling point
It's usually important for aggressive decks to have lands that can be used the turn they come into play, but with so few dual lands, A-Raiyuu is in danger of the dreaded mana screw