Hold by the edges
This can still be devastating for a variety of things, such as combos that rely on creating an infinite number of enters-the-battlefield triggers, landfall decks, or strategies that rely on cards such as Animate Dead
Nissa, Ascended Animist is my choice for a mythic wildcard because it can generate huge creatures or be a massive game-winning mass pump
Mercifully, Stock Up is still technically a fairly cheap MTG card, all things considered
Atarka, World Render Simple, yet effective (the epitome of Gruul), Atarka, World Render gives all your attacking dragons double strike
This doesn't tap, invest three mana, draw one of around five cards, shuffle the rest back