The attack trigger's worded in such a way that you could give your teammate extra tokens when they attacked with Warriors
The trigger event doesn't have to specifically refer to "creatures." In these cases, the trigger event may also refer to something being "put into a graveyard from the battlefield." For example, if the equipped creature or an emblem you own has an ability that triggers "whenever an artifact is put into a graveyard from the battlefield," that ability would trigger twice if an artifact creature died
The leader of the Boros Legion grants you an extra attack step each turn
You dont really need any particular synergy for this to be worth slotting, but its a great way to fill your graveyard or pump sizing-sensitive cards like Alesha, Who Laughs at Fate
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Equip Equipped creature gets +3/+3 and doesn't untap during its controller's untap step