Tocasia's Onulet

The Onulet is one of Antiquities' oldest bits of design lore: an artifact creature that pays you back when it dies, a small drain of life to soften the blow of losing a body you spent mana to build. This construct inherits that death-gift and hands it a second life through unearth, which turns a single point of value into two. Cast it once and it dies for two life. Unearth it and it comes back with haste for a swing, then exiles at end of turn, triggering the leaves-the-battlefield clause a second time for another two. That interaction between the two abilities is the whole reason to run it: unearth is normally a raw tempo engine (a body from the yard that never sticks), but pairing it with an on-departure trigger converts the mandatory exile from a downside into an upside. The self-exile no longer costs you anything, because the creature was going to give you its parting gift either way. It reads as a colorless artifact until unearth pulls it into white, which is the color that has always cared most about incremental life buffers and sacrifice loops. Nothing here is efficient in isolation: a five-mana 4/4 with no evasion is a floor. The value lives in the graveyard, where a spent construct becomes a second attacker and four total life across its two departures.