In the case of Dokuchi Shadow-Walker, the Ninjutsu is simply too expensive
It comes down to whether you want to be the only one drawing extra cards, or if youre fine with opponents drawing cards, so long as you can get in on the action
Emrakul, the World Anew brought back the spaghetti creature's mind control prowess with an effect that steals all your opponent's creatures, and a hefty madness cost for inspired deckbuilders out there
Scion of the Ur-Dragon Scion of the Ur-Dragon places dragons in the graveyard from your library and becomes a copy of them until the end of your turn
Red-hot embers illuminate the pitch-black night and sparks flare into an inferno as Charizard ex surges forth with newfound powers of darkness
So, for example, in your Sun & Moon list, I wouldnt consider Vileplume GX an alt art, since thats the only full art Vileplume GX in Cosmic Eclipse