This three-mana Blue artifact gives every planeswalker you control two new abilities, they can pay 0 loyalty to proliferate - which can give them an extra counter - and they can pay 12 loyalty to allow you to take an extra turn
Importantly, Auras controlled by other players don't cause creatures you control to become modified
Here are how Non-Elf decks often brew around two of these cards and an earlier slot
Vagrant Plowbeasts is one of the most annoying cards when your opponent has one mana open
Considering pairing Simba, Scrappy Cub with cards like Little John, Robins Pal, Aurora, Dreaming Guardian and Fang, River City - one of the newly added location cards found in Into the Inklands
A lot of control decks simply look like things that delay the game as long as possible to land a big Revelation