Sylvan Hierophant

The whole design lives in one word: "another." When this Cleric dies, the triggered ability goes on the stack with its target already fixed to a creature card in your graveyard other than this one, so even though the ability instructs you to exile the Hierophant and then return a creature, it could never have chosen itself as the target in the first place. The exile and the restriction are not redundant; they answer different questions. The exile keeps the spent body out of any further graveyard recursion you might be running, while the word "another" is the line that prevents a self-rebuy loop. What you actually get is a 1/2 green body that converts its own death into a creature back in hand, turning a combat trade or a sacrifice into delayed card advantage. The retrieval is dictated by the board rather than by you: there is no activated ability to sandbag, no way to fire it on demand, only a death trigger that pays out exactly one card whenever the body finally falls. This is recursion stapled to a creature that was going to chump or trade anyway. The rate reflects an older valuation of green's recursion, from before the color folded reanimation and graveyard value into its baseline kit; it looks quaint precisely because the design space it sat at the edge of has since been thoroughly mapped.