Another route to help boost your deck is using cards that protect from board destruction effects, like Heroic Intervention or Eldrazi Monument to make them indestructible
Meanwhile, Izzet Charm can still counter that planeswalker (admittedly in a much less efficient way since it costs twice as much as Spell Pierce does), but it can also kill the Dark Confidant and, when the other modes are dead, potentially improve your hand by looting away some extra lands, Faithless Lootingstyle
Additionally, the Russian version of the Double Masters announcement appears to have revealed a third card, Atraxa, Praetors Voice, though the image was quickly changed before we could verify its authenticity
The History of Populate in MTG Populate is the Selesnya mechanic for Return to Ravnica from 2012
It's very easy to hold onto the past trying to recreate what once was
Nantuko Shrine is a card that creates squirrel tokens each time anyone casts a card, at a rate of one squirrel for each card with the same name in any graveyard