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Infantry Shield I definitely slot an Infantry Shield into any of my Valduk, Keeper of the Flame decks

8 Purging Stormbrood Draconic Protection Omen cards in Tarkir: Dragonstorm fill multiple roles in your Limited deck, letting you hang on to them for a bit if you want the creature side, or to cast the generally cheaper omen side for a more immediate need

Now there is only one Lotus that is more expensive than the Beta one, right

Use the extra mana to deploy your commander ahead of schedule or cast game-changing spells turns earlier than opponents expect

Honorable Mentions It wouldnt be fair to have the conversation about countering spells without mentioning some of the most format defining cards