Demonstrate is an ability with a huge number of potential applications, and by granting it every turn, the Twelfth Doctor will quickly facilitate a very busy board, growing more powerful with counters all the while
(That philosophy has shifted quite a bit over the years.) Mirri was given protection from black because black creature kill was a big part of the Standard metagame at the time
Abomination of Llanowar Elf decks are very good at going wide, and sometimes you also need a huge tower
Evidence Examiner: Finally, this Simic beauty is both an enabler and payoff for collecting evidence
The warp mode is mostly for the decks with low curves a la Amped Raptor and Summon: Brynhildr, as the payoff with this is getting a Elkin Bottle-style draw and then getting it for free on top of a 3/3 later on but its great how well Warp lets you get the best of both worlds with Evoke (you dont give up the creature.) The 3-for-1 fits this much better than Starfield Shepherd, since youre getting draws out of this, even if they may just be temporary