Shore Up

Three riders for one blue mana, and the untap clause is the one doing the heavy lifting. Protection spells like this were built to answer removal at instant speed: give a creature hexproof in response to a targeted burn spell or exile effect, and the removal fizzles on the stack. Stapling a +1/+1 pump onto that turns it into a combat trick as well, letting an attacker survive a block it would otherwise lose. But the untap is what pushes it past a defensive protection spell and into engine territory. Flash it during your own combat and a creature that already attacked can be readied to block; flash it after a tap-to-activate ability and the creature is available to do the job twice; combine it with a creature whose tap ability matters and the spell doubles an activation while the removal it dodges resolves into nothing. What keeps the card honest is that each of the three riders is individually modest, so it only earns its slot when a deck wants two of them at once: a hexproof pump that also untaps, cast at the moment an opponent commits to a two-for-one. It is a piece of interaction dressed up as a trick, and the untap is the clause doing the disguising.