It is solely introduced by cards that say You take the initiative. When that happens, you venture into the undercity
When I spoke with the principal game designer Annie Sardelis at MagicCon Amsterdam, she stated that "anytime we [WotC] made up a creature, we would just kind of look through the book for, like, what is a characteristic about that creature we can evoke." Following up on this, principal designer Gavin Verhey said: "If it's in The Hobbit, it's in the set somewhere." Based on the Hobbit cards we've seen so far, this certainly rings true
When Creeperhulk hits play suddenly all your other dorks can be 5/5 tramplers too and that is a whole lot of reach
Tarkir: Dragonstorm releases on April 11, and you can now preorder Play Boosters, Collector Boosters, Commander decks, Bundles, and more from your local game store, online retailers like Amazon, and elsewhere Magic products are sold.
Lifegain has started to get more draw, too
Its really difficult to not know about TCG mid is nowadays