Steel Seraph automatically comes with flying, so even if its your only creature in play, you can at least push some damage through with its solid stats and evasion
Honestly, this app is no-frills and rather rudimentary in nature, but it also comes with a few other handy features for enhancing your MTG gameplay experience, including poison counters, a dice roller, a game over detector, and more
I will quickly state that the order of these has no actual relevance
A 0/4 Defender is great at holding off early Aggro onslaughts, which is crucial in current Standard
Fill in the other slots around this colorless planeswalker with lifegain, ramp, and card draw and you get a bomb late game play that excels in Brawl or some niche Pioneer decks