The main deck is generally good against creature based decks, the higher their average mana cost the better. It can interact with non-creature combo strategies using
Blink of an Eye and
Lay Claim and should put up a fair fight against Control decks. This deck is weak against very low cost aggro decks and ETB triggers. I don’t see any way of gaining an advantage here. I’ve tried sideboarding up to twelve two-mana one for ones, like
Essence Scatter, but it still felt like a losing battle, so I think it’s best to not waste any spots on these matchups.
Against Control: We get to have some fun. Transform into a creature-less Mill deck by replacing Tempest Djinn with Psychic Corrosion and they will be stuck with a handful of dead creature removal cards. You likely want to side in Negate and possibly Leave in the Dust. Choose what to take out based on the opponents deck. Likely Unsummon since it’s card disadvantage. You won’t win a counter spell fight and the game is going to go very long so I’d usually take out Censor unless they rely on a non-creature win-con.
Against everything else: The strategy is to just do our own thing only better. That means we need more Tempest Djinn! For the fifth and sixth we can use Mirror Image. For the seventh an Aethertide Whale. These numbers feel right to me. Two Mirror Image and five creature targets seems like an acceptable risk. Take out three of the Lay Claim’s for the creatures. Negate can replace Censor, I’d rarely, if ever play them both and often don’t play either. If there’s any other weak card in the matchup, replace it with Leave in the Dust. With luck, this can keep up to an aggro deck which will struggle to remove a 3 mana 4 toughness creature while the bounce effects slow them down a lot. Two unanswered Tempest Djinn’s can do 20 damage very quickly.