While the text is blurry in the ad, a new Heatran card has an ability that appears to activate whenever Arceus ex is in play
Zekrom and Reshiram both appear to be emerging from the card itself due to the texturing and overall design of the card
For now, this Feraligatr is lurking
It also nullifies your opponent's graveyard - pretty backbreaking for strategies like 'Dredge' that rely on the 'yard - and allows you to grab your opponent's best threat from the void and play it free of charge (Okay, at the cost of its own life, but it's a lowly two-drop, so who cares?) Paired with targeted discard cards like the popular Thoughtseize, Dauthi Voidwalker has the potential to be super scary
When first joining the battlefield, Esper Sentinels power will likely be low enough for people not to bother about it
Few decks want both effects, those that do can rarely afford six mana