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Arcades, the Strategist and Felothar the Steadfast are the two most popular, but you can also look to Doran, the Siege Tower, Doran, Besieged by Time, and Plagon, Lord of the Beach as some secondary choices

It's even more busted that it doesnt have a mana cost to activate

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And if he really wants to activate Sundial of the Infinites ability, you cannot hinder that