If one of your creatures disappoints you in battle, you can always use Summary Execution to sacrifice it to draw cards and gain life
3 Unexpected Dai which unfortunately clashes with Imperial Bower, but you have no way of searching Bower so it's rarely a problem
That sounds like an equivalent exchange, but it can often work against you
Ultimately, the successful Selesnya (or SelesNaya) deck in Standard is probably going to draw on more than one of these macro ideas rather than espousing only one idea
Intimidating And Awe-Inspiring says Whenever one of your characters challenges, they gain Resist+2 during that challenge
Artifact Color tag templates(None) O-Kagachi, Vengeful Kami Flying, trample Whenever O-Kagachi deals combat damage to a player, if that player attacked you during their last turn, exile target nonland permanent that player controls