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You can theoretically flicker most monarch permanents or give them flash, but only Denethor lets you do it with no other effects

Can I order a pack of cards instead of just one

After sideboarding, you can change what the game is about, abandoning your low-impact creatures that would get caught in sweepers and instead presenting a midrange deck similar to theirs, but with counters and Eldrazi, and surprise them with a plan of going over the top of them without overcommitting to the battlefield

For example, the Mewtwo ex card has a Retreat Cost of two energy

For instance, Arceus VSTARs ability allows you to look through your deck and choose two cards to bring into your hand at will