Survival of the Fittest has nothing to do with the mechanic, other than being able to tutor for the creatures you need
Creature Artifact - Avatar Phyrexian Color tag templates(None) Thopter Assembly Flying At the beginning of your upkeep, if you control no Thopters other than this creature, return this creature to its owner's hand and create five 1/1 colorless Thopter artifact creature tokens with flying
If you want to discard, you may attack first, deal combat damage, and then discard what you want
I can open a Jumpstart pack and get cards from the Core 2021 set that I can then use to build other Standard legal decks (even though I wouldnt because Im a professed deckbuilding hater)
My current inclination is that Mangara, the Diplomat is great in the 99 of any Mono White deck and some Boros decks too as generic card draw
Plus, all of these are nonfoil