Undergrowth Mechanic's Novelty

I feel undergrowth is a bit different from mechanics taken from individual cards and turned into a word (such as landfall, sunburst or kicker) because it's been widely-used and in particular is a big part of how green uses the graveyard. Innistrad alone had at least four 'undergrowth' cards: Spider Spawning, Gnaw to the Bone, Boneyard Wurm and Grim Flowering, as many cards as some named mechanics. It's been used with multiple other effects. In no sense is it a new or poorly-explored mechanic.

Being a focused mechanical theme is a different animal than having a few individual cards. The game is celebrating its 25th anniversary and we’ve printed over 18,000 unique cards. Finding mechanics that we’ve never done before on any cards should be seen as a cool thing that occasionally happens rather than something to be constantly expected.

Boneyard Wurm Card Printing Gnaw to the Bone Green Grim Flowering Innistrad Kicker Landfall Mechanics Spider Spider Spawning Sunburst The Graveyard Undergrowth Wurm