The casting cost, the flavor text, the mechanics they all riff off of Nivs endless Curiosity (which to be clear synergizes incredibly with the first two versions of Niv, and is a straight up combo with Niv-Mizzet, Parun)
Scarecrow Tribal isnt something that many players would think is even viable in Commander, and yet the Reaper Kings ability makes even a single Scarecrow a massive threat
Extra combat spells la World at War and Seize the Day are amazing with Velomachus, to the point that it feels like the best thing you can do
If you have your commander out, you can choose both modes, which is a plus
This is one of the few draw effects in green that isnt tied to creatures in any way, and has seen lots of reprints, including a Hatsune Miku Secret Lair crossover
There is a gap between the collectors who got lucky and the collectors who made their livelihoods off of the hobby