At end of combat, if Kytheon and at least two other creatures attacked this combat, exile Kytheon, then return him to the battlefield transformed under his owner's control.
: Kytheon gains indestructible until end of turn.
+2: Up to one target creature an opponent controls attacks Gideon during its controller's next turn if able.
+1: Until your next turn, target creature gains indestructible. Untap that creature.
0: Until end of turn, Gideon becomes a 4/4 Human Soldier creature with indestructible that's still a planeswalker. Prevent all damage that would be dealt to him this turn.
Deploy Kytheon as a turn-one 2/1, then build a wide board so you can attack with three creatures and flip him into the resilient Gideon, Battle-Forged. From there you grind value with indestructibility and aggressive attacks while a token/aggro army closes the game. He's a cheap, low-curve aggro anchor that wants you racing the table rather than playing the long game.
One-mana commander that pressures life totals immediately and is hard to kill thanks to indestructibility
Flips into a planeswalker that protects your team and itself, providing built-in card advantage and resilience
Enables an extremely low curve and explosive go-wide starts in mono-white
Cheap to recast from the command zone, so removal rarely sets you back far
Requires attacking with three creatures to flip, so board wipes and stalled boards leave him stuck as a 2/1
Mono-white lacks card draw and ramp, so you can run out of gas against control
Vulnerable to exile, bounce, and -X/-X effects that dodge his indestructibility
As a small aggressive commander, he struggles in slow, grindy multiplayer pods if you can't close fast