If I did have to pick a recent set to compare it to, Id probably say Lost Caverns of Ixalan , with the tendency for aggro decks to pivot towards indirect damage in the lategame, and the powerful lategame in various colors and flavors
The drawback is he only applies his bonus to other modified creatures
You can get yourself a sizable body for only four mana in decks like Progenitus, Reaper King, Zacama or The Ur-Dragon, to name a few
(If this creature has no +1/+1 counters on it, put two +1/+1 counters on it.) Modified creatures you control have trample
Another key attribute of Tadashi is the "Inventor" typing
Craft: Immediately Copies: 4 The full cycle of Legendary artifacts are very powerful and looked good playing with and against them