Learn only applies when lessons are in your sideboard and you want to fetch them
Its essentially the perfect alpha strike counter
Finally, Red + Green Burn tends to punish what Green hates, namely all-things winged or artificial (Clan Defiance, Cindervines, Ruric Thar, the Unbowed, etc.), or staples Burn onto already-useful effects (Vengeful Rebirth, Exploding Borders, etc.)
In the case of Lilianas Standard Bearer, you have a 3/1 for three mana you can Flash onto the battlefield that lets you draw a card for each of your creatures that died this turn
Its tough, though, as Beast Withining your opponents stuff makes for a sometimes-difficult Golem to have to push through
Then you gain 3 life if that player has more life than each other player