Oko's second ability may target a permanent that is only temporarily an artifact or a creature
Attacking into an open board or getting around blockers by attaching equipment and auras to Keleth can quickly power this Horse up into a brutal attacker
Even when you expand the definition of "Mox" out to include dubious entries like Paradise MantleParadise Mantle and Jeweled AmuletJeweled Amulet, Mox JasperMox Jasper currently sits at the bottom of the rankings
Obeka, Splitter of Seconds Every set has a ton of legendary creatures these days, but there's often one or two outliers, cards that make EDH players sit up, take notice, and possible salivate
You can have an Archon of Cruelty or an Aetherflux Reservoir
Even if Geralfs Messenger has no counters and should be put into a graveyard, it will never reach it