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Lets have a look at some strong candidates currently in Standard

Reshiram & Charizard-GX give Mewtwo & Mew-GX a slew of powerful moves to choose from, and can easily deal a minimum of 230 damage

This is the problem of deciding whether a computer program with a specific input will finish running or continue forever

harder to learn

Everyone is aware how strong Bolas's Citadel is, but in the Command Zone it's likely to draw hate, on top of needing a Haste enabler to compete with the likes of Krrik and having substantial potential to fizzle with lands on top

pay two blue mana, get another copy of an artifact on the field