Whisperwood Elemental

The flagship of the manifest mechanic, and the card that justified the keyword existing at all. Manifest's whole premise was a face-down body that could be a creature waiting to flip, a noncreature card hiding as a beater, or just fodder to cash in later; the trouble with one-shot manifest spells is that the variance only resolves once. This turns the one-shot into an engine. At the beginning of each of your end steps it converts your top card into a fresh 2/2 with concealed upside, so instead of drawing and setting a card aside, you plant it on the battlefield and decide later whether it was a spell worth leaving face down or a creature worth its mana. The sacrifice ability reads as an afterthought and isn't: it staples a manifest-on-death rider onto your face-up nontoken creatures, so the bodies you've already flipped or hard-cast turn a single Wrath of God into a wave of new face-down blockers. The "face-up" wording is doing precise work: your still-hidden manifested cards don't gain the trigger, so the protection rewards the creatures you've committed and revealed rather than the ones still concealed. The tension it resolves is that green's card advantage usually arrives as dead cardboard or expensive draw; here it shows up as battlefield presence that defends itself, resists sweepers on the back foot, and turns noncreature draws into pressure. Green's attrition engine without leaving its color pie.