No one wants to have their The Ur-Dragon taken down by a 1/1 cast by for a single
And if that weren't enough, the Greenwarden doubles all friendly Landfall triggers, which can quickly overwhelm the opponent
Here is a list of the cards I have noticed: Lighthouse Chronologist, Artificer Class, Barbarian Class, Cleric Class, Druid Class, Fighter Class, Monk Class, Paladin Class, Ranger Class, Rogue Class, Sorcerer Class, Warlock Class, Wizard Class Phyrexian Dragon Engine Meld seems to have a similar issue.
Getting events on your calendar early allows more players to discover themespecially new players who may be looking for a local game store to call home
Their Name is Death destroys all non-artifact creatures for the fair cost of three generic and three black mana