Shepherd of the Clouds

The recursion clause reads like ordinary white value until you notice the switch built into it: control a Mount and the returned permanent goes straight to the battlefield instead of your hand, converting a slow rebuy into a genuine reanimation trigger. Without a Mount, this is a five-mana flier that buys back a cheap permanent, a fine but unremarkable rate for a 4/3 with flying and vigilance. With one, the same body cheats a three-mana-value-or-less permanent into play for no additional cost, which is a different card entirely: an enchantment, an artifact, a planeswalker, or a small creature landing on the spot the moment the Pegasus resolves. The mana-value-3-or-less ceiling caps what the battlefield version can steal back while leaving the hand version open to grab anything in that band. The Mount requirement is the sharper cost: it does not ask you to saddle anything, only to already control one, so the payoff rides on deckbuilding commitment rather than a per-turn activation. That is the tension this card resolves, and it resolves it by assuming you have already bought into a mechanic and then rewarding that buy-in with a mode-flip most white creatures never get to make, turning a value flier into a free reanimation the instant the board conditions line up.