Turn 2 Raise the Alarm into turn 3 Hordeling Outburst followed by turn 4 Jeskai Ascendancy, convoke out Stoke the Flames and Triplicate Spirits and attack for fifteen sounds ridiculously powerful and there are a number of different variations on that theme abusing the convoke mechanic
Its hybrid identity as both a midrange deck and a combo deck allows it to attack from multiple angles that make it difficult for many decks to defend from
[-10]: For each creature card in your graveyard, put a +1/+1 counter on each creature you control
Whether you chump block with it, watch it get wrapped up in a Cyclonic Rift, or it becomes collateral damage of a Toxic Deluge, Boreas Charger has actually put in some solid work in my mono-white decks, as well as occasional work in non-green multicolor builds
Since your creature with the finality counter changes zones, the finality counter falls off and comes back into play without any stipulations
It makes for a slightly slow start, but it means that once Charizard is on the field, it can decimate almost anything that the opponent has on the field, making for a very strong late game