Balan, Wandering Knight
Legendary Creature — Cat Knight
First strike
Balan has double strike as long as two or more Equipment are attached to it.
: Attach all Equipment you control to Balan.
"What weapon will you bear against one who's mastered them all?"
Svetlin Velinov
Commander Masters (CMM)
• #16Rulings
Balan's activated ability has no timing restriction. You can activate it any time you have priority.
(wotc • 2017-08-25)
If Balan deals first-strike damage and then gains double strike (most likely because it picked up some Equipment with its activated ability after first-strike damage was dealt), it will also deal regular combat damage.
(wotc • 2017-08-25)
Rulings
Balan's activated ability has no timing restriction. You can activate it any time you have priority.
(wotc • 2017-08-25)
If Balan deals first-strike damage and then gains double strike (most likely because it picked up some Equipment with its activated ability after first-strike damage was dealt), it will also deal regular combat damage.
(wotc • 2017-08-25)