In terms of price, Biovisionary is also much less exciting than Approach
Note that there are no brakes here like once per turn or one class of spell like non-creatures
Also, like enchantments, some artifacts affect the game as a whole, like (Angel's Feather)
Theres also the classic aggro bind, where if you try to get far enough ahead to race their Baneslayer Angel, they might just cast Supreme Verdict, and if you have Reflector Mage for it, they might just not draw a creature
Honorable Mentions Theres a few non-samurai that either interact with the creature type or make tokens
Even as more and more cards were produced, the pump spell held a place of power