Pine Walker

The whole design hangs on a timing quirk: turning a morph face up does not reset its tapped status, so a creature that flips comes into its new form still swinging. The untap trigger that rides on top of the flip pays out in the attack step. Send the hidden 2/2 into combat, wait for blockers, then flip: it deals a 5/5's worth of damage, and because the reveal untaps it, the attacker walks out of combat standing rather than tapped down. That is pseudo-vigilance applied after the fact, decoupling the tapped status from the act of attacking without ever paying for vigilance proper. The clause reaches every other morph you control too, so any face-down body you flip untaps itself as it reveals: each morph carries its own reset, and a board of hidden threats converts every flip into a creature that can block on the crackback. The 5/5 body and the ordinary morph cost are scaffolding; the untap rider is the real work, turning a single combat reveal into a fresh untap on the creature that flipped. It grants no second attack and never untaps the flipping creature for offense on the turn it already swung: the payoff is purely availability afterward, a body that hit hard and is still up when the counterswing comes.