Shelter

Protection that pays for itself, with one catch worth understanding. Most fog-the-blocker tricks ask you to spend a card to win a combat or rescue a creature; the cantrip stapled here means a successful cast breaks even on cards no matter how the combat resolves. You no longer need the blowout to justify the spell, which quietly changes the math on when you hold it up. Shelter can blank a targeted removal effect, slip a key attacker past a blocker, fizzle an aura or equipment of the named color, and refund itself in the process. The catch is the target requirement: because the spell needs a creature you control, an opponent who responds to your cast by killing that creature first leaves Shelter with no legal target. It fizzles, and you draw nothing. The replacement card is the reward for resolving, not a guarantee. That target dependency is also the design tension this kind of effect lives or dies on. A free, untargeted counter-to-removal at instant speed would be oppressive; tying it to a creature already on the board and a color you have to name correctly holds the cost down, while the draw makes the narrow cases tolerable rather than dead. Protection from the wrong color does nothing, and naming the color means reading the opponent's hand or board correctly. But when it connects, it converts a removal spell into a wasted card and a fresh one, and that asymmetry is why self-replacing protection became a template Wizards has returned to.