Anax & Cymede Tiny Leaders - Heroic Humans with Prowess!

Tons of one-drop instants and sorceries that Target Creatures to set off Heroic abilities (Mostly just Anax and Cymede 's, but the other ones are useful too)

If Phalanx Leader gets out, I only need to target Anax and Cymede once per turn for the trample, and the rest of the targeting can go towards permanent counters, rather than a one-turn +1/+1

Strive is good, because it can proc multiple instances of heroic in one-shot.

Crown of Flames & Flickering Ward are good, repeatable triggers for Heroic and Prowess.

Rounded out with token generating spells (Gather the Townsfolk, Launch the Fleet, Molten Birth ) that proc prowess abilities, and give Anax and Cymede more creatures to buff.