nightmare mtg card Magic The Gathering - Activate only as a sorcery MH3] Chthonian Nightmare (via WotC)

Jace, the Mind Sculptor [Best Planeswalker for Control Strategies] Jace, the Mind Sculptor gives you a Brainstorm every turn at zero loyalty cost

Your opponents can always just play a single spell on their turn if they are constantly casting a big spell spending all their mana then not really affecting them anyway

Plus, attacking with 6 or more total power in one turn may be easier than you think

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Kaya, Spirits Justice Justice for all Murders at Karlov Manors planeswalker is Kaya, Spirits Justice, a four-mana white and black planeswalker with three loyalty

They have a much smaller window for coming into play tapped, letting you leverage them for more of the game