mtg cards that affect all players Target player phases out. : r/custommagic Split card - MTG Wiki

Ive used it to cast things as innocuous as Cultivate all the way up to exiling a Surge to Victory and exiling my Ephemerate while I had Aurelia, the Warleader in play (spoilers: thats a combo)

Bone Devourer Book Devourer Devourer of Destiny Devourer of Memory Dream Devourer Effluence Devourer Faceless Devourer Galactus, Devourer of Worlds Intellect Devourer Morlun, Devourer of Spiders Nim Devourer Phyrexian Devourer Shriekwood Devourer Silvar, Devourer of the Free Thallid Devourer Thassa's Devourer Thought Devourer Venom, Deadly Devourer

Clarion Conqueror is a perfectly curve-friendly answer to stop activated abilities

Every time one of your dragons attacks, you get to tap down a nonland permanent your opponent controlsand it stays tapped through their next untap step

and gets the Unflinching Courage Aura as a bonus