When one of your cards or unit's abilities causes one of your opponent's units to be tapped, attach Toro Calican's Ambition to one of your unique Bounty Hunters.
Equipped unique Bounty Hunter gets "Bounty: Draw a card." and Intimidation
Keywords
Bounty
Bounty: [bonus]: A layered ability triggered during a unit discard that means, "When another unit is discarded by damage from this unit, you gain the following when your next build step starts." Bounty triggers even if the attacking unit leaves play. Bounty works in the build zone. You will gain the bounty even if the attacking unit is sent to the discard pile. The unit can't collect a bounty on itself.
Equip
Equip: A selective effect on Equipment activated during the build step that means, "Attach this Equipment to a unit. Play only during your build step." You can pay the Equip cost only once per turn.
Intimidation
Intimidation: An isolated, static ability that means, "This unit gets +10 speed, +1 power, and +1 health for each of your opponent’s units in this arena."