Getting card draw when creatures die over the course of the game is already great, but its the -1 toughness that really gets this engine running
No matter what these little rascals are doing, they look cute
If an ability of an artifact, creature, or planeswalker is countered this way, that permanent loses all abilities for as long as this creature remains on the battlefield
For tutor targets, one of the best is Unesh, Criosphinx Sovereign, which is sort of a hidden commander for the deck, supercharging all our sphinxes like Defiler of Dreams
That means in addition to destroying a problem land, it can help with your color fixing if you're struggling to cast something and you're lacking the right colors