This brings me to my absolute favorite part about being a flipper
Proxy cards can't be played in DCI-sanctioned events
Kosei, Penitent Warlord Kosei, Penitent Warlord asks you to get at least one aura, one equipment, and any type of counter on it
The issue is that getting to four birds doesnt seem very easy
The human race has suffered enough
In standard it was the core to the aptly named Puresteel Paladin deck, using its main ability to draw into more action and later on the metalcraft ability to cheat out on some equip costs, but it has also seen play in Cheerios, a deck based around 0 mana artifacts and Paradoxical Outcome to eventually cast Grapeshot, and most recently in Hammer Time, which focuses on Colossus Hammer, where Puresteel Paladin once again comes in to both help circumvent equip costs