B: Counter. Toad pulls out Peach to counter an attack.
B^: Rocket. Toad pulls out a rocket from the ground as seen in Super Mario Bros 2. Initially it will go straight up, the player will gain directional control after it passes a certain height. The Rocket will explode if Toad collides it into the ground or wall, or until its timer runs out.
Bv: Toad can pull out a Mushroom Block and launch it at the enemy. Mushroom Blocks remain on the field for a period of time and can be picked up/ used as platforms. This might make a really interesting and trolly edge guarding technique if you launch an opponent far enough to the point where they would've grabbed onto the ledge had it not been for a strategically placed Mushroom Block.
B>: Toad Kart/ Super Mushroom. Toad hops into a Kart and drives around dealing damage to enemies he collides into, by pressing B> again Toad consumes a Super Mushroom and gains a sudden burst of speed dealing increased damage to opponents.
While in his Kart Toad is only able to perform a single short hop and can cancel this move by shielding. If Toad is holding an item he can press Z while tilting the control stick to throw the item in a given direction.