In the leadup to Blackest Night, one of the first things Scar does is send Green Lanterns Ash and Saarek on a suicide mission, as the pair are a Vampire Hunter and a Necromancer respectively and thus the Lanterns' most experienced in dealing with the undead, which could spell trouble for Scar's grand design.
In Blood and Thunder, Warboss Gorgutz sends Skyva on a suicide mission to get his gargant back from a rebellious nob in hopes of killing him. When that fails, he gives Skyva command of the gargant and sends it to the front lines. This still fails, as when Castillan blows up the gargant, the head flies up and lands on the warboss, promoting Skyva to the position.
Crossed: In the first issue of "Grave New World", one of the children in Captain Barnes’ group says that their fundamentalist leader killed Melissa and Leo, two other members of the group, for breaking his rule against anyone having sex. Another kid protests that Barnes only sent them out on a scavenging mission, with the first kid replying that this is a Distinction Without a Difference. The beginning of the next issue shows Melissa and Leo finding a barge loaded with valuable supplies. Melissa wants to use it to get accepted back by Barnes while Leo recognizes that Barnes sent them to die in the first place and never wants to see him again. This disagreement leads to Melissa striking Leo with a hatchet.
Those who encounter Groo the Wanderer keep sending the titular character against impossible odds with little support both to get rid of Groo and sometimes serve as a distraction (This includes his family and "friends"). But since he's a One-Man Army and has the element of surprise (since no one would be stupid enough to attack, except Groo) he succeeds with the unintended consequences on those who sent him.
Mister Miracle (2017) has a double-sided version of this: Scott (aka Mister Miracle) gets sent on behalf of Orion and New Genesis to meet up with Granny Goodness for peace negotiations with Apokolips, but is given the order to assassinate her instead. Once they actually unite, Granny alleges that she was actually a mole for New Genesis all along (she was supposedly the whistleblower informing New Genesis that Darkseid had claimed the Anti-Life Equation, sparking the current New Genesis/Apokolips skirmishes), and was secretly ordered by Orion to murder Scott in turn, allowing him to seize full control of New Genesis. The true veracity of this is unclear, especially as Big Barda kills her as ordered, but this leads to a further wedge between Scott and Orion, with Scott's noncompliance ending with him being charged with treason against his own home.
In the prologue chapter of Necrophim, Lucifer sends Uriel to kill the king of the frost giants in order that he will die in the attempt.
The Warlord: While serving as mercenaries, Chakal sends Morgan and what remains of the squad ahead to take on a Frost Giant, hoping the giant would kill them and he can claim the bounty for himself. Needless to say, he has seriously underestimated Morgan.
Wonder Woman (1987): In the Messner-Loebs run, Hippolyta receives visions of Diana's death in the line of duty. Desperate to keep her daughter safe, Hippolyta arranges a new tournament for the position of Amazon champion and rigs it in favor of the Bana-Mighdall's Artemis. Artemis becomes the new Wonder Woman and ultimately dies in Diana's place. Diana learns of her mother's deception and their relationship becomes strained.
