Astor, Bearer of Blades rules interaction
Platform: iOS
Gamemode: Historic Brawl
TL;DR: Astor, Bearer of Blades allowing free equips. Either a bug, or is a busted ability that needs to be rebalanced.
I was playing historic brawl against an opponent using Astor, Bearer of Blades as their commander. My opponent would spend all of their mana playing out equipments (including tapping all their mana rocks like Mox Amber), and then would proceed to equip multiple equipments to their creatures without paying any mana. I'm not sure if another equipment they had was causing these strange interactions with Astor's ability, but this is either an unintentional bug, or intentional and just busted. In the case of the latter, I recommend that Astor's ability give a hard minimum to equip costs. Being able to equip 5+ equipments to a single creature for free seems unfair.
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[Deleted User] commented
Reading your opponents cards would have likely answered this question.
Astor gives equipment the ability Equip 1. Bladehold War-Whip reduces the equip cost of other equipment by one. If your opponent had these two in play, all equipment other than the War-Whip can be equipped for 0