"We've been looking for a place to put Transformers, and in a world full of giant mechs and sweet artifacts, it made sense." The former allows players to cast them on the backside for an alternate cost while the latter makes all Transformers in vehicle mode also count as a create and does not require it to be crewed
The only exception to this rule to my knowledge is Fists of Flame which costs 2 mana but can easily pump your army into lethal attackers
Of the three full Tyranid Genestealer cards, I think they do a nice job of capturing that element
Shalai and Hallar turns +1/+1 counters into damage, and this deck is full of ways to put them on creatures and overwhelm your opponents
Its most obviously great with Delve, but there are just so many cards it sets up any of the Zombify effects, Returned to the Ranks, Ojutais Command, Alesha, Who Smiles at Death, Rally the Ancestors, Whip of Erebos, etc
It's no longer a Human