Hello,
Deck is currently running smoothly, not encountering that many issues with its mana despite only having 14 lands.
Here are the changed I operated lately and why:
Main Board:
-1 Aether Hub +1 Island: I really like having 4 untapped dual lands, and having access to a 5th and 6th one, but got some issues sometimes were I don't draw an Islandand get instead the second Aether Hub. I've kept 1 Aether Hub as a Tendo Ice Bridge, and I've switched the second one for the IslandI needed.
Sideboard
-2 Sweltering Suns +2 Fiery Cannonade: Double Red can be troublesome. I've liked the 3 damages, as it can take care of some threats (Yes, I'm looking at you, Whirler Virtuoso), but the 2 damage instant has some pretty good upsided, like it don't kill Riddleform or Soul-Scar Mage and is an instant, perfect to awaken our Riddleform. Trying it now.
-1 Negate -2 Vance's Blasting Cannons
Flip +3 Unsummon: With 4 Spell Pierce and 2 other Negate, non-creature spells are pretty well covered, the 7th counter was not often required. Vance's Blasting Cannons
Flip is very good for the long term, but cost 4 mana, which was a bit too expensive for this deck. Instead, with Unsummon, we get a way to remove tokens (The Scarab God ones for exemple), bounce a creature to push through or get some time, or even protect our threats as this deck is threats-lite.
E_mouchet