Since most of your game youre going to be discarding a bunch of cards to Professor Sycamore and Ultra Ball, its very likely that one or both of these cards are in your discard pile
The idea is that flying and trample should help control planeswalkers, and all of the three mana creatures are good against opposing creatures
Standard Ranked puts you on the competitive ladder, using only the cards available in the Standard format at the moment, but if you have more cards from previous sets, choose Historic Ranked to have the freedom to use all the cards you want
Ninja for the Win-ja
You can tap Hazel and pay two life to tap a bunch of untapped tokens you control, adding mana in any combination equal to the number of tokens you tapped
You can create powerful chains with him, wherein you play an aura on Chishiro, thus creating a token, then play an aura on the token, creating another, and so on