Take your time building your deck
Setzer, Wandering Gambler Setzer, Wandering Gambler has hoops to jump through to flip coins on its own, but the real reason this card makes the list is the last sentence
Emry, Lurker of the Loch Emry, Lurker of the Loch is an efficient bit of self-mill with recursive potential, but this card requires a high concentration of artifacts, making it one of the narrower options on the list
If a nontoken creature an opponent controls would die, instead exile it and you gain 2 life
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And though it isn't one of the specific examples listed by Magic judges, card size differences could be considered a form of marking