Pikachu was shown very quickly, but you can perfectly make out its spoiler
In Magical Christmas Land, this could even allow us to cast a Garruk Wildspeaker, who can untap two lands to give us access to three mana (due to Utopia Sprawl) and then a Wistful Selkie
Unsurprisingly, this card also saw a very limited release
Legendary Creature - Human Wizard Color tag templates(None) Ethereal Investigator Flying When this creature enters, investigate X times, where X is the number of opponents you have
Bringing Karametra's potent ramping capabilities together with enchantments that have landfall triggers like Zendikar's Roil and Felidar Retreat lets you turn your lands into value
There are, of course, weaknesses to a mill strategy some players include cards that prevent themselves from losing to an empty library, like Ulamog, the Infinite Gyre