Elvish Soultiller

Most graveyard recursion in green pulls cards forward into your hand or onto the battlefield; this one does the opposite, shuffling an entire creature type's worth of dead cards back into the library where you have to draw them again. That sounds like a downside, and in a vacuum it nearly is, but the death trigger is the wrinkle worth studying: the controller chooses the type after this dies, and the type chosen does not have to be Elf. In a deck stacked with one tribe, the trigger refuels the library against decking and erases an opponent's graveyard hate in one motion, since cards shuffled back cannot be exiled where they sat. The 5/4 body for five is incidental; the card is a self-contained anti-mill and graveyard-reset engine that happens to attack. It rewards being killed, which inverts the usual incentive structure around a finisher: you want it traded off, sacrificed, or chump-blocked into death so the trigger fires. The honest constraint is that the effect is slow and library-shuffling, not card advantage, so it only matters in a grind long enough that running out of cards is a real failure state. Built as a tribal payoff for the Onslaught block's creature-type matters theme, it speaks most clearly to decks that already commit fully to a single type and need insurance against attrition rather than tempo.