Ethereal Ambush

Manifest usually shows up at the tail end of a tapland or a sorcery-speed value engine, where it functions as a placeholder: a face-down body hiding a creature you might unmask later. This one takes the keyword's one genuinely combat-relevant application and builds a whole spell around it. Flash in two 2/2 blockers at instant speed, drop them onto an empty board mid-combat to trade with attackers, and keep the option to flip either into a creature you paid to hide. The bodies are the floor; whatever you stacked in your deck is the ceiling. That split is the whole tension. Cast blind off a random draw, you get two vanilla 2/2s for five mana at instant speed, a rate nobody wants. Set it up behind library manipulation, or run it in a deck stuffed with fat creatures, and each manifest becomes a delayed threat that unmasks into something the opponent never had a read on, with the instant-speed timing letting you pick the moment to flip. The trouble is that the flashy build (ambush a fatty into a blocking assignment, flip it up, blow out combat) and the reliable build (two defensive bodies exactly when you need them) point at different decks, and the card commits to neither. It is manifest's flash showcase, and the keyword rarely gets to be this reactive anywhere else.