Maybe the land idea should be tested. It looks a little slow and requires mana, which the bazaar deck is sorta slow at. But testing would tell. Usually you kill with colos not damage...
Gush is not as great in this deck as others, but it still has its tricks why it stays. You can use it as regular mana boost+against wastelands with a little minus as the opponent usually tries to kill your groves which you cant bounce. The gush lands can go to fayden discard or bazaar.
If theres a ton of workshop you can add more ancient grudges which is a fine card with bazaar and intuition. Theres just no room! You need a lot of blasts against leovold and control in general. Rebs are good right now, always been but stops many key drawing spells anything blue matchup wise paradox, oath mentor etc etc and good with fayden.