Cards like Agent of Masks, Blind Hunter, Ghost Council of Orzhova, Mourning Thrull, Orzhov Guildmage, and Pillory of the Sleepless all bled your opponent to death, draining one life point at a time (well, two in the case of Blind Hunter)
The few that survived and remained dormant were eventually found 100 years later by the wizards of the Riptide Project
Upon entering the battlefield, this commander lets you exile any number of non-land permanents you control until Abdel Adrian leaves the battlefield, creating a 1/1 Soldier for each permanent exiled this way
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Professors Research in Sword & Shield has the exact same effect, but like Hop is a Supporter card, limiting its use to one turn