Tellah, Great Sage is a little vulnerable to removal since its only a 3/3, but untap with this in a good spells deck and I cant imagine youd lose very often
While this wont often prevent people from playing their Wrath of God or Decree of Pain, it does produce value in a situation where you might be losing your creatures
Once you have six Gates, all the Gates-matter cards become quite good, but they only behave at bomb-tier once you have more than eight

Aclazotz, Deepest Betrayal Blech, Loafing Pest Blex, Vexing Pest Call Forth the Tempest Deadly Tempest Dragon Tempest Dragonhawk, Fate's Tempest Eccentric Pestfinder Fateful Tempest Fire Tempest Living Tempest Ojer Axonil, Deepest Might Ojer Kaslem, Deepest Growth Ojer Pakpatiq, Deepest Epoch Ojer Taq, Deepest Foundation Overgrown Pest Pest Control Pest Infestation Pest Mascot Pest Rescuer Pest Summoning Pestbrood Sloth Pestered Wellguard Pestermite Pestilence Pestilence Demon Pestilence Rats Pestilent Cauldron Pestilent Haze Pestilent Kathari Pestilent Souleater Pestilent Spirit Pestilent Syphoner Pestilent Wolf Pests of Honor Send in the Pest Shu Yun, the Silent Tempest Signal Pest Tapestry Warden Tapestry of the Ages Teacher's Pest Tempest Angler Tempest Caller Tempest Djinn Tempest Drake Tempest Efreet Tempest Hart Tempest Hart Tempest Harvester Tempest Hawk Tempest Owl Tempest Technique Tempest of Light Tempestra, Dame of Games Tend the Pests Thrasta, Tempest's Roar Volrath, the Shapestealer Zaffai and the Tempests

Pairing this ability with a very good max speed is the icing on the cake for a very interesting Azorius commander revolving around artifacts and crazy amounts of value generated by doubling them
Rashmi and Ragavan Hear me out: Ragavan Typal