The Last Agni Kai give mana if your creature is dealt excess damage
The Last Agni Kai says "Target creature you control fights target creature an opponent controls. If the creature the opponent controls is dealt excess damage this way, add that much {R}." However if your creature loses the fight and is dealt excess damage you get the mana. As you can see from the picture my opponent gained 1 floating red when their creature lost the fight after I pumped my creature.
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PhazonHunter#81038
commented
Can confirm. Opponent used the Last Agni Kai on their Pirate Peddlers (2/2 deathtouch) to fight my Mongoose Lizard (5/6) and ended up getting 3 mana to use on their next spell. If I wasn't super far ahead this could've allowed them to stabilize an otherwise lost game. Very ugly bug.
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pikanxiety#14016
commented
Second this, just happened to me as well.