Sylvan Safekeeper

Protection bought with land. The activated cost here is the whole transaction: every land you sacrifice converts permanent board presence into a single instant-speed window of untargetability, and the math holds up because the creature gaining shroud can be the one carrying your win condition. Shroud is harsher than hexproof; it locks out your own targeted buffs too, which means this is not a card you fire idly. It is a backstop. The cost is sacrifice, not mana, so the land can already be tapped out from casting your threat: you leave the safekeeper open and wait for the removal spell, the bounce, the Aura you are trying to deny, then crack a land in response and watch the spell fall off the stack with no legal target. Note the limit baked into shroud: it stops anything that targets your creature, but it does nothing against an edict that targets you and forces a sacrifice. Against pointed interaction, though, repeatable land-sacrifice is the rate that makes it dangerous: you are not protecting a creature once, you are protecting it as many times as you are willing to bleed your manabase, and against a deck trading one-for-one that exchange can win the long game outright. The land cost is also why the body stays at the floor of what a creature can be; the protection is the product, the 1/1 is just the housing it ships in. In any deck built around a single irreplaceable threat, this turns targeted interaction from a clean answer into a resource race the safekeeper's controller usually wins.