It exiles all permanents from the game and makes you discard your hand
The only thing lacking here is an ultimate worth caring too much about
Mark Rosewater, who joined Matt Tabak on the reveal stream, said battles will be a deciduous mechanic - meaning they wont appear in every set, but the design team can return to that creative wellspring as often as they want to as it isnt tied to a specific plane
For 6 mana, you get a 4/4 red Dragon Elemental creature token with flying and prowess
Seeing that we're going to be casting giant creatures, Selvala will often be able to create more mana than all of your lands in play combined
When Grakmaw dies, create an X/X black and green Hydra creature token, where X is the number of +1/+1 counters on Grakmaw