The Knights Lost Lover

Flash
Whenever another creature you control deals damage to a player or planeswalker, You gain {e}.
Whenever another creature you control attacks you may pay {e} to attach target equipment to that creature without paying it's equip cost.
partner with The Mourning Knight
If The Mourning Knight would enter the battlefield while this is card is on the battlefield,
return this card to the command zone without increasing it's mana cost.