mtg cards like akroma's memorial Most Valuable Special Guests In not actual card. MtG 2013 Core Set Mythic

Grim Reaper's Sprint might be the strongest new card across all the decks as a potential 2-mana extra combat spell

Whispers of the Muse (T1, Ext, S, Block) A favorite in "Turbo Xerox" (a blue deck which used minimal land but a ton of cantrips to thin out the deck), Counter-Phoenix (Shard Phoenix + Forbid) and Tradewind-Awakening (put Awakening on the stack, tap all your lands for mana, untap all your lands), Whispers has what might seem like a hefty price to pay for one card but you get to do it turn after turn after turn

Oonas Blackguard

If your draw step doesnt quite get you to victory, you can activate your Triskaidekaphile at instant speed to close things out

Other cards have better, more generic options